ETAILS ZILLDIFFEQMODAP11 4.2.003. he indicated function yı(x) is a solution of the given differential equation. Use reduction of order or formula (5) in Section 4.2. e-SP(x) dx Y2 = yıx) si dx (5) v %) as instructed, to find a second solution y2(x). y + 100y = 0; y, = cos(10x) y =

To find an antiderivative F() with the given conditions, we can use the fundamental theorem of calculus. Let f(x) be the function we want to find the antiderivative of. Then, we know that:
F(x) = ∫f(t)dt + C where C is the constant of integration. We can find C by using the initial condition F(1) = 0.:
F(1) = ∫f(t)dt + C = 0
Since we are given F'(1) = f(2), we can use this to find the value of C:
F'(x) = f(x)
F'(1) = f(1) = 10+21,2 +2126
f(2) = 10+21,2 +2126
F(2) = ∫f(t)dt + C = F(1) + ∫f(t)dt
= 0 + ∫f(t)dt
= ∫f(t)dt
So we can use the fact that F'(2) = f(2) to find:
F(2) = ∫f(t)dt = F'(2) = 10+21,2 +2126

Now we can solve for C:
0 = F(1) = ∫f(t)dt + C
C = -∫f(t)dt
So our final antiderivative is:
F(x) = ∫f(t)dt - ∫f(t)dt
= ∫f(t)dt + K where K is any constant. We can find K using the fact that F(1) = 0:
F(1) = ∫f(t)dt + K = 0
K = -∫f(t)dt
Therefore, the antiderivative we are looking for is:
F(x) = ∫f(t)dt - ∫f(t)dt
= ∫f(t)dt - ∫f(t)dt + ∫f(t)dt
= ∫f(t)dt + 10+21,2 +2126 - ∫f(t)dt
= 10+21,2 +2126
So F(x) = 10+21,2 +2126 is the antiderivative we are looking for.

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The probability of a value being greater than 0.72 in a standard normal distribution is approximately 0.2357. The probability of more than 14.8 ounces being dispensed in a cup is approximately 0.2357 or 23.57%.

To solve this problem, we need to calculate the deviation of 14.8 ounces from the mean of 13 ounces and express it in terms of standard deviations.
Deviation = (14.8 - 13) = 1.8
Standard deviation = 2.5
Now, we can use a standard normal distribution table or calculator to find the probability that a value from a normal distribution with a mean of 0 and a standard deviation of 1 is greater than 0.72 (1.8/2.5).
Using the table or calculator, we find that the probability of a value being greater than 0.72 in a standard normal distribution is approximately 0.2357. Therefore, the probability of more than 14.8 ounces being dispensed in a cup is approximately 0.2357 or 23.57%.

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a)

The value of dy/dx = sec² x

b)

tan 61° is approximately equal to √3 + 2°.

There are three commonly used trigonometric identities.

Sin x = Perpendicular / Hypotenuse

Cosec = Hypotenuse / Perpendicular

Cos x = Base / Hypotenuse

Sec x = Hypotenuse / Base

Tan x = Perpendicular / Base

Cot x = Base / Perpendicular

We have,

a)

We have y = tan x.

Differentiating both sides with respect to x, we get:

dy/dx = sec² x

Now, when x = 60°, we have:

dy/dx = sec² 60° = 2

This means that when Δx = 1°, Δy = (dy/dx) Δx = 2 x 1° = 2°.

b)

Using the approximation in part a, we can find an approximate value of tan 61° as follows:

tan 61° ≈ tan 60° + Δy

= y + Δy (since y = tan 60°)

= tan 60° + 2°

= √3 + 2°

Therefore,

a)

dy/dx = sec² x

b)

tan 61° is approximately equal to √3 + 2°.

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The work done on the model rocket when the engine pushes it 130 m into the air is 832 J.

What is distance?

Distance is defined as the amount of space between two objects or points. It is a measure of how far apart two things are and can be measured in a number of different units, such as miles, kilometers, feet, and meters. Distance is an important concept in physics and other sciences, and is used to measure various properties of physical objects. Distance also has many applications in everyday life, such as measuring the length of a road trip or the distance between two cities.

The work done (in joules) on the model rocket can be calculated using the equation W = F * d, where W is the work done, F is the force applied, and d is the distance traveled. In this case, the force applied is 6.4 N and the distance traveled is 130 m. Therefore, the work done on the model rocket is:

W = 6.4 N * 130 m

W = 832 J

Therefore, the work done on the model rocket when the engine pushes it 130 m into the air is 832 J.

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The histogram represents the sampling distribution of the proportion of heads in 10 flips of the coin, which is an example of a binomial distribution.

In this scenario, the parameter of interest is the true population proportion of heads in a coin flip. The process of flipping the coin 10 times and recording the proportion of heads is an example of a binomial distribution, where each flip is a Bernoulli trial with a probability of success (getting heads) of 0.5.
By repeating this process many times and creating a histogram of the results, we are creating a sampling distribution of the proportion of heads in 10 flips of the coin. This allows us to see the variability of the proportion of heads we could get from different samples of the same size.
If we are using simple random sampling, meaning each possible sample of 10 coin flips has an equal chance of being chosen, then there should be no bias present in our results. However, if we are using a different sampling method, such as convenience sampling, there could be a bias present in our results.

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Answer:

12.99

Step-by-step explanation:

The spinner that could be used to simulate pulling a bead out of the bag without looking would have three sections: 6 white, 1 red, and 1 pink.

What is probability?

Probability is a measure of the likelihood or chance of an event occurring. It is a number between 0 and 1, with 0 representing an impossible event and 1 representing a certain event. The probability of an event is calculated by dividing the number of ways the event can occur by the total number of possible outcomes.

To simulate pulling a bead out of the bag without looking, we need a spinner with three sections, each section representing one of the three colors: white, red, and pink. The size of each section should be proportional to the number of beads of that color in the bag.

The total number of beads in the bag is 18 + 3 + 3 = 24.

Therefore, the proportion of white beads is 18/24 = 3/4, the proportion of red beads is 3/24 = 1/8, and the proportion of pink beads is 3/24 = 1/8.

To create a spinner with these proportions, we could divide a circle into 8 equal sections, color 6 of them white, 1 of them red, and 1 of them pink.

Hence, the spinner that could be used to simulate pulling a bead out of the bag without looking would have three sections: 6 white, 1 red, and 1 pink.

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It's important to consider personal financial priorities and budget accordingly.

Location: The cost of living can vary greatly depending on where you live. Movie theaters located in cities or tourist areas may charge more for snacks compared to those located in suburban or rural areas.

Type of movie theater: The type of movie theater can also influence the cost of snacks. Luxury or premium movie theaters may charge more for snacks and offer a wider selection of premium snacks.

Time of day: The time of day can also influence snack prices. Movie theaters may offer discounts for snacks during matinee showings or other off-peak hours.

Personal preferences: The amount spent on snacks can vary depending on individual preferences. Some people may prefer to bring their own snacks from home, while others may prefer to purchase snacks at the movie theater.

Size of snacks: The size of snacks can also affect the cost. Larger sizes of popcorn, candy, or soda may cost more than smaller sizes.

Overall, the amount spent on snacks at the movie theater can vary greatly depending on a variety of factors. It's important to consider personal financial priorities and budget accordingly.

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The total time for the CPU to access all 100 instructions is 250 ns (for accessing the remaining 50 instructions) + 400 ns (for replacing the first 50 instructions) = 650 ns.

The total time for the CPU to access 100 program instructions can be calculated by adding the time taken to access the first 50 instructions, the time taken to replace those with the next 50, and the time taken to access those next 50 instructions.
1. Time to access the first 50 instructions: 50 instructions * 5 ns/instruction = 250 ns
2. Time to replace the first 50 instructions with the next 50: 400 ns
3. Time to access the next 50 instructions: 50 instructions * 5 ns/instruction = 250 ns
Total time = 250 ns (first 50) + 400 ns (replacement) + 250 ns (next 50) = 900 ns

The CPU needs to access a total of 100 instructions, but only the first 50 are already in memory. So, it needs to access the remaining 50 instructions from memory, which will take 50 * 5 = 250 ns. However, since the memory can only hold 50 instructions, it needs to replace the first 50 instructions with the next 50, which takes 400 ns.  Therefore, the total time for the CPU to access all 100 instructions is 250 ns (for accessing the remaining 50 instructions) + 400 ns (for replacing the first 50 instructions) = 650 ns.

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The probability that the person selected suffers from hypertension is 0.20, which corresponds  to option A.

To find the probability that the person selected suffers from hypertension, we need to add up the proportion of people who suffer hypertension, regardless of whether or not they are overweight.

We know that the proportion of people who are both overweight and suffer hypertension is 0.09, so the proportion of people who suffer hypertension and are not overweight is 0.11 (since the total proportion of people who suffer hypertension is 0.09 + 0.11 = 0.20).

Therefore, the probability that the person selected suffers from hypertension is 0.20, which is option A.
In this problem, we are given the probabilities of different scenarios in the adult population. To find the probability that a randomly selected person suffers from hypertension, we need to add the probabilities of both scenarios that involve hypertension.

The probability of a person being both overweight and having hypertension is 0.09, and the probability of a person not being overweight but having hypertension is 0.11.

To find the total probability of a person having hypertension, we simply add these two probabilities: 0.09 + 0.11 = 0.20.

So, the probability that the person selected suffers from hypertension is 0.20, which corresponds to option A.

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The integral of 2x(x-3) dx is ∫2x(x-3) dx = 2∫x²-3x dx = 2(x³/3 - 3x²/2) + C, where C is the constant of integration. Thus the answer is 2(x³/3 - 3x²/2) + C.

To evaluate the integral of the function 2x(x-3) dx, follow these steps:
1. Expand the function: 2x(x-3) = 2x^2 - 6x
2. Integrate term by term: ∫(2x^2 - 6x) dx = ∫2x^2 dx - ∫6x dx
3. Apply the power rule to each term:
  - For ∫2x^2 dx: (2/3)x^3 + C₁
  - For ∫6x dx: (6/2)x^2 + C₂
4. Combine the results: (2/3)x^3 + C₁ - (6/2)x^2 + C₂
5. Simplify and write the general form of the integral: (2/3)x^3 - 3x^2 + C, where C is the constant of integration.

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The general solution to the given homogeneous differential equation is y = C1 + C2e5t, where C1 and C2 are arbitrary constants

To find the general solution to the given homogeneous differential equation, we first need to find the roots of the characteristic equation:

r² - 5r = 0

Factorizing, we get:

r(r-5) = 0

So, the roots of the characteristic equation are r1=0 and r2=5.

Since ri < r2, we have r1=0 and r2=5.

Now, we can write the general solution in the form:

y = C1e0t + C2e5t

Simplifying, we get:

y = C1 + C2e5t

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.

A differential equation is an equation which contains one or more terms and the derivatives of one variable (i.e., dependent variable) with respect to the other variable (i.e., independent variable)

The instantaneous charge q(t) on the capacitor for t > 0 can be determined by solving the differential equation for the circuit. The differential equation for a series RLC circuit is:

Lq''(t) + Rq'(t) + (1/C)q(t) = E(t)

where q(t) is the instantaneous charge on the capacitor, E(t) is the voltage applied to the circuit, L is the inductance, R is the resistance, and C is the capacitance.

In this case, we have L = 1/2 H, R = 10 ohms, C = 0.01 F, and E(t) as given. To find q(t), we need to solve the differential equation subject to the initial conditions q(0) = 0 and q'(0) = 0.

First, we can simplify the differential equation by substituting in the given values:

(1/2)q''(t) + 10q'(t) + (1/0.01)q(t) = 10 for 0 ≤ t < 5

(1/2)q''(t) + 10q'(t) + (1/0.01)q(t) = 0 for t ≥ 5

Next, we can solve this differential equation using standard methods for solving second-order differential equations with constant coefficients. The characteristic equation is:

(1/2)r^2 + 10r + 100 = 0

Using the quadratic formula, we can solve for the roots:

r = (-10 ± sqrt(100 - 4(1/2)(100)))/(1/2)

r = -10 ± 10i

The general solution to the differential equation is then:

q(t) = c1cos(10t) + c2sin(10t) + 200/3

where c1 and c2 are constants determined by the initial conditions.

Using the initial condition q(0) = 0, we get:

0 = c1 + 200/3

c1 = -200/3

Using the initial condition q'(0) = 0, we get:

q'(t) = -20/3*sin(10t) + c2

Using the fact that q'(0) = 0, we get:

0 = -20/3*sin(0) + c2

c2 = 0

Therefore, the solution to the differential equation with the given initial conditions is:

q(t) = -(200/3)cos(10t) + 200/3 for 0 ≤ t < 5

q(t) = Asin(10t) + B*cos(10t) for t ≥ 5

where A and B are constants to be determined by continuity of q(t) and q'(t) at t = 5.

Continuity of q(t) at t = 5 requires:

-(200/3)cos(50) + 200/3 = Asin(50) + B*cos(50)

Continuity of q'(t) at t = 5 requires:

(200/3)sin(50) = 10Acos(50) - 10B*sin(50)

Solving these two equations for A and B, we get:

A ≈ -54.022

B ≈ 60.175

Therefore, the solution for q(t) for t ≥ 5 is:

q(t) ≈ -54.022sin(10t) + 60.175cos(10t)

Finally, we can combine the two solutions to get the complete solution for q(t):

q(t) = -(200/3)*

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The given statement " the p-value for a Coefficient helps determine if it is statistically significant" is true. In statistical analysis, p-values are used to test the null hypothesis, which typically states that there is no significant relationship between the variables being analyzed.

A low p-value (usually below a predetermined significance level, such as 0.05) suggests that the null hypothesis can be rejected, indicating that there is a statistically significant relationship between the variables.

In the context of regression analysis, the p-value for a coefficient represents the probability of observing the obtained coefficient, or a more extreme one, under the assumption that the null hypothesis is true. If the p-value for a coefficient is low, it suggests that the corresponding independent variable is significantly related to the dependent variable. This means that the variable has an impact on the outcome and is not due to random chance.

To summarize, the p-value for a coefficient helps determine if it is statistically significant. A low p-value indicates that the null hypothesis can be rejected, suggesting a significant relationship between the variables. In regression analysis, a low p-value for a coefficient implies that the corresponding independent variable has a significant impact on the dependent variable.

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The absolute maximum value is -7 and it occurs at x = -1, while the absolute minimum value is negative infinity and it occurs at x = positive infinity.

As we consider the interval (-∞, +∞), there is no boundary limit, hence we need to find the critical points to locate the maximum and minimum of the function.

To do this, we need to find f'(x) and set it equal to zero to solve for the critical points.

f'(x) = 1 - 8x

Setting f'(x) = 0 and solving for x, we get x = 1/8.

Now, we need to check if this critical point is a maximum or minimum by checking the sign of the second derivative.

f''(x) = -8, which is always negative. This means that the critical point is a maximum.

Now, we need to check the values of the function at this critical point and at the endpoints of the interval (-∞, +∞).

f(-∞) = -∞, f(1/8) = -9.015625, f(+∞) = -∞

Therefore, the absolute maximum is -9.015625, which occurs at x = 1/8.

There is no absolute minimum as the function approaches negative infinity at both ends of the interval.

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The series ∑(−1)^k+14/2k+1 is divergent and neither absolutely nor conditionally convergent.

To determine whether the series ∑(−1)^k+14/2k+1 is absolutely convergent, conditionally convergent, or divergent, we can use the alternating series test and the absolute convergence test.

First, we can apply the alternating series test, which states that if a series satisfies the following conditions, then it is convergent:

The terms of the series alternate in sign.

The absolute value of each term decreases as k increases.

The limit of the absolute value of the terms approaches zero as k approaches infinity.

In this case, the series satisfies the first two conditions, since the terms alternate in sign and decrease in absolute value. However, the third condition is not satisfied, since the limit of the absolute value of the terms is 1/3 as k approaches infinity, which is not equal to zero.

Therefore, we cannot conclude whether the series is convergent or divergent using the alternating series test.

Next, we can apply the absolute convergence test, which states that if the series obtained by taking the absolute value of each term is convergent, then the original series is absolutely convergent.

If the series obtained by taking the absolute value of each term is divergent, but the original series converges when some terms are made positive and others are made negative, then the original series is conditionally convergent.

In this case, if we take the absolute value of each term, we get:

|(-1)^k+14/2k+1| = 1/(2k+1)

This is a p-series with p = 1, which is known to be divergent. Therefore, the series ∑(−1)^k+14/2k+1 is also divergent when the absolute value of each term is taken. Since the series is not absolutely convergent, we need to check whether it is conditionally convergent.

To check for conditional convergence, we can examine whether the series obtained by taking the positive terms and negative terms separately is convergent. In this case, if we take the positive terms, we get:

∑ 1/(2k+1)

which is a p-series with p = 1, and therefore divergent.

If we take the negative terms, we get:

∑k=1 to infinity -1/(2k+1)

which is also a p-series with p = 1, and therefore divergent. Since both the series obtained by taking the positive terms and the negative terms separately are divergent, we can conclude that the series ∑(−1)^k+14/2k+1 is not conditionally convergent.

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The solution to the given differential equation using the Laplace transformation is x(t) = 3cos(t) - (3/2)cos(2t) + 2sin(t), where x(0) = 3 and x'(0) = 1.

Using the Laplace transform of sin(2t), we get:

L{sin(2t)} = 2/(s² + 4)

Substituting this value in the above equation, we get:

(s² + 1) L{x} = 12/(s² + 4) + 3s - 1

Solving for L{x}, we get:

L{x} = (12/(s² + 4) + 3s - 1)/(s² + 1)

Now, we need to find the inverse Laplace transform of L{x} to get the solution to the differential equation. We can do this by using partial fraction decomposition, and then finding the inverse Laplace transform of each term.

After using partial fraction decomposition, we get:

L{x} = (3s/(s² + 1)) - ((3s-1)/(s² + 4)) + (2/(s² + 1))

Taking the inverse Laplace transform of each term, we get:

x(t) = 3cos(t) - (3/2)cos(2t) + 2sin(t)

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The value of limit [tex]\lim_{x \to \infty}[/tex] (x² - x³) e²ˣ is  -∞, so negative infinity means that the function decreases without bound as x gets larger and larger. This is because the exponential term grows much faster than the polynomial term.

To evaluate the limit

[tex]\lim_{x \to \infty}[/tex] (x² - x³) e²ˣ

We can use L'Hopital's rule. Applying the rule once, we get

[tex]\lim_{x \to \infty}[/tex] [(2x - 3x²) e²ˣ + (x² - x³) 2e²ˣ ]

Using L'Hopital's rule again, we get

[tex]\lim_{x \to \infty}[/tex] [(4 - 12x) e²ˣ + (4x - 6x²) e²ˣ + (2x - 3x²) 2e²ˣ]

Simplifying, we get

[tex]\lim_{x \to \infty}[/tex] (-10x² + 8x) e²ˣ

Since the exponential term grows faster than the polynomial term, we can conclude that the limit is equal to

[tex]\lim_{x \to \infty}[/tex] (-∞) = -∞

Therefore, the limit of (x² - x³) e²ˣ as x approaches infinity is negative infinity.

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The general indefinite integral of the function Sect(sec t + tan t)dt is Tan(sec t + tan t) + sec t + tan t + C

Now, let's look at the given function Sect(sec t + tan t)dt. To solve this integral, we need to first simplify the function. We can do this by using the trigonometric identity:

Sect(sec t + tan t) = Sec²(sec t + tan t)/Sec(sec t + tan t) = (1 + Tan²(sec t + tan t))/Sec(sec t + tan t)

Now, we can rewrite the integral as:

∫ Sect(sec t + tan t)dt = ∫ (1 + Tan²(sec t + tan t))/Sec(sec t + tan t) dt

We can further simplify this by using a trigonometric substitution. Let u = sec t + tan t. Then, du/dt = sec(tan) + sec²(sec t + tan t). This can be rewritten as du = (sec(tan) + sec²(sec t + tan t))dt. Substituting these values into the integral, we get:

∫ (1 + Tan²(u))/Sec(u) * (du/sec(tan) + sec²(u)dt) = ∫ (1 + Tan²(u))/Sec(u) * du/sec(tan) + ∫ (1 + Tan²(u))/Sec(u) * sec²(u) dt

The first integral can be simplified using another trigonometric identity: sec(tan) = 1/cos(tan). Thus, we can rewrite the integral as:

∫ (1 + Tan²(u))/Sec(u) * du/sec(tan) = ∫ (cos(u)/cos(u) + sin(u)/cos(u)) * du = ∫ (1/cos(u) + Tan(u))du

This integral can be easily solved using the substitution v = sin(u), which gives us:

∫ (1/cos(u) + Tan(u))du = ∫ (1/√(1-v²) + v/√(1-v²))dv = ln| v + √(1-v²)| + C = ln| sin(u) + √(1-sin²(u))| + C

Now, let's look at the second integral:

∫ (1 + Tan²(u))/Sec(u) * sec²(u) dt = ∫ (1/cos²(u) + 1) du = Tan(u) + u + C

Substituting back u = sec t + tan t, we get:

Tan(sec t + tan t) + sec t + tan t + C

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Solve the given differential equation using the separation of variables.

The given equation is y = 3xy', and the initial condition is y(0) = 9. Let's follow these steps:

1. Rewrite the equation in terms of dy/dx: dy/dx = y / (3x)

2. Separate the variables by dividing both sides by y and multiplying both sides by dx: (1/y) dy = (1/(3x)) dx

3. Integrate both sides of the equation with respect to their respective variables: ∫(1/y) dy = ∫(1/(3x)) dx

4. Perform the integration: ln|y| = (1/3)ln|x| + C

5. Solve for y by exponentiating both sides: y = Ax^(1/3), where A = e^C

6. Apply the initial condition y(0) = 9 to find A: 9 = A(0^(1/3))

Since 0^(1/3) is equal to 0, we find that A = 9.

So, the solution to the differential equation is: y = 9x^(1/3)

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It would take approximately 8.66 years for $3850 to double if it is invested at 8% compounded continuously

Since, The formula for continuous compounding is given by,

⇒ [tex]A = P e^{rt}[/tex]

where A is the final amount, P is the principal amount, r is the annual interest rate, t is the time in years, and e is the mathematical constant approximately equal to 2.71828.

Hence, By Using this formula, we can solve for t as follows:

[tex]2P = P e^{rt}[/tex]

[tex]2 = e^{rt}[/tex]

ln(2) = rt

t = ln(2) / r

Substituting the values given in the problem, we get:

t = ln(2) / 0.08

t ≈ 8.66 years

Therefore, it would take approximately 8.66 years for $3850 to double if it is invested at 8% compounded continuously.

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The value of ∫ 1 4 f(x) dx is 8.4. We first tart by using the first given information: ∫ 1 5 f(x) dx = 12

We can also use the second given information by writing:

f(4) = (1 / (5 - 4)) * ∫ 4 5 f(x) dx = 3.6

f(4) = ∫ 4 5 f(x) dx

Now, we can use the fact that the integral of a function over an interval can be split into two integrals over subintervals. Therefore,

∫ 1 5 f(x) dx = ∫ 1 4 f(x) dx + ∫ 4 5 f(x) dx

We know that ∫ 1 5 f(x) dx = 12 and ∫ 4 5 f(x) dx = f(4) = 3.6, so we can substitute these values and solve for ∫ 1 4 f(x) dx:

∫ 1 4 f(x) dx = ∫ 1 5 f(x) dx - ∫ 4 5 f(x) dx
= 12 - 3.6
= 8.4

Therefore, ∫ 1 4 f(x) dx = 8.4.

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Answer:

from top to bottom left to right brainliest please

Step-by-step explanation:

1. 30

2. 32

3. 270

4. 175

5. 156.75

6. 504

The value of the angle ACB is 22 degrees

To determine the angle, we need to take note of the properties of a triangle.

These properties include;

From the diagram shown, we have that;

<CD0 = 22 degrees

<COD = 90 degrees; angle at right angle

Since their sum is equal to 180 degrees, we have;

22 + 90 + <DDC0 = 180 degrees

collect the like terms

<DCO = 180 - 112 = 68 degrees

then, <ACB + 68 = 90 degrees

collect like terms

<ACB = 22 degrees

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The probability of being issued this specific license plate combination is zero.

We have,

The concept used in this explanation is that the probability of an event occurring is zero if the event is not possible or if it violates the given conditions.

In the given license plate combination "QHLT91," one of the letters is "Q." However, since Florida does not use the letter "o" on license plates, it is not possible for the license plate to have the letter "Q."

Therefore,

The probability of being issued this specific license plate combination is zero.

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3√3 must be irrational, the real number 3 + √3 must be irrational.4 – 15 is irrational and  3 - √5 must be irrational.

Assume for contradiction that 3√3 is rational.

There exist integers a and b (with b ≠ 0) such that 3√3 = a/b.

Cubing both sides

we get 27×3 = (a/b)³, or

27b³= a³.

Thus, a³ is divisible by 3, so a must be divisible by 3.

Let a = 3k for some integer k.

Substituting into the previous equation

we get 27b³ = (3k)³ = 27k³, or b³ = k³.

Thus, b³ is divisible by 3

so b must also be divisible by 3.

But this contradicts the assumption that a and b have no common factors.

Therefore, 3√3 must be irrational.

Hence, 3√3 must be irrational, the real number 3 + √3 must be irrational.4 – 15 is irrational and  3 - √5 must be irrational.

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The series is an alternating series because its terms alternate in sign, and the magnitude of the terms decreases as n increases.

The given series, 1-1/2-1/3+1/4+1/5-1/6+1/7..., can be written in sigma notation as Σ (-1)ⁿ+1 / n, where n starts from 1 and goes to infinity. Here, (-1)ⁿ+1 is a factor that alternates between positive and negative values as n changes. This means that every other term in the series is negated, giving rise to an alternating series.

Now, to decide who is correct, we need to understand what an alternating series is. An alternating series is a series whose terms alternate in sign, that is, the terms are positive, negative, positive, negative, and so on.

Therefore, based on the definition and properties of an alternating series, it can be concluded that Notando is correct in arguing that the given series is alternating. Tando's disagreement is not valid in this case.

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Answer:

The given equation is 2x

2

−10x+k=0

Here, a=2,b=−10,c=k

∴D=b

2

−4ac=(−10)

2

−4×2×k=100−8k

The given equation will have real and equal roots, if

D=0⇒100−8k=0⇒k=

8

100

​

=

2

25

​

Step-by-step explanation:

The scatter plot of fees versus days taken to fill a job for Sarin Employment's sample data suggests that there may be a positive linear relationship between the two variables.

a. To construct a scatter plot in Excel, we would plot the fees on the y-axis (dependent variable) and the days taken to fill a job on the x-axis. Each data point would be represented as a dot on the graph.

Next, to calculate the correlation coefficient and test for statistical significance, we can use a statistical calculator or software. In this case, since the alpha level is given as 0.05, we will use a significance level of 0.05 for our hypothesis test.

b. The correlation coefficient, also known as the Pearson correlation coefficient, measures the strength and direction of the linear relationship between two variables. It ranges from -1 to 1, where -1 indicates a perfect negative linear relationship, 0 indicates no linear relationship, and 1 indicates a perfect positive linear relationship.

To test for statistical significance, we will conduct a hypothesis test with the following hypotheses:

Null Hypothesis (H0): There is no statistically significant linear relationship between fees and days taken to fill a job.

Alternative Hypothesis (H1): There is a statistically significant linear relationship between fees and days taken to fill a job.

We will use a two-tailed test since we are interested in determining whether there is any linear relationship, regardless of the direction.

If the calculated p-value is less than our chosen significance level of 0.05, we will reject the null hypothesis and conclude that there is a statistically significant linear relationship between fees and days taken to fill a job.

Therefore, by analyzing the scatter plot and conducting a hypothesis test, we can determine the apparent relationship between fees and days taken to fill a job and assess whether it is statistically significant.

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The derivative of f(x) = arccos(x^2) is: f'(x) = -2x / √(1-x^4)

The derivative of f(x) = arccos(x^2), we'll use the chain rule. The chain rule states that the derivative of a composite function is the derivative of the outer function times the derivative of the inner function. In this case, the outer function is arccos(u) and the inner function is u = x^2.

First, let's find the derivative of the outer function, arccos(u). The derivative of arccos(u) is -1/√(1-u^2). Next, we'll find the derivative of the inner function, x^2. The derivative of x^2 is 2x.

Now we'll apply the chain rule. We have:

f'(x) = (derivative of outer function) * (derivative of inner function)

f'(x) = (-1/√(1-u^2)) * (2x)

Since u = x^2, we'll substitute that back into our equation:

f'(x) = (-1/√(1-x^4)) * (2x)

So, the derivative of f(x) = arccos(x^2) is:

f'(x) = -2x / √(1-x^4)

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