1) -15+4r=-9
-15+4r=-9
We move all terms to the left:
-15+4r-(-9)=0
We add all the numbers together, and all the variables
4r-6=0
We move all terms containing r to the left, all other terms to the right
4r=6
r=6/4
r=1+1/2
2) 5-y/3=-1
5-y/3=-1
We move all terms to the left:
5-y/3-(-1)=0
We add all the numbers together, and all the variables
-y/3+6=0
We multiply all the terms by the denominator
-y+6*3=0
We add all the numbers together, and all the variables
-1y+18=0
We move all terms containing y to the left, all other terms to the right
-y=-18
y=-18/-1
y=+18
3) 42=-5x-8
42=-5x-8
We move all terms to the left:
42-(-5x-8)=0
We get rid of parentheses
5x+8+42=0
We add all the numbers together, and all the variables
5x+50=0
We move all terms containing x to the left, all other terms to the right
5x=-50
x=-50/5
x=-10
Mr. K's math class is 1 {1}{4} hours long. After working problems on the board for 55 minutes {11}{12}hour), he gave the students the rest of the class period to work on homework. How long did students have to work on homework? Write your answer in simplest form.
The number of hours that students have to work on homework will be 1/3 hours.
What is subtraction?It simply implies subtracting something from an entity, group, location, etc. Subtracting from a collection or a list of ways is known as subtraction.
Mr. K's maths class is 1 and 1/4 hours long.
After working problems on the board for 55 minutes or 11 / 12 hour.
He gave the students the rest of the class period to work on homework.
Then the number of hours that students have to work on homework will be
⇒ 1 + 1/4 - 11/12
⇒ 5 / 4 - 11/ 12
⇒ (15 - 11) / 12
⇒ 4/12
⇒ 1/3 hours
More about the subtraction link is given below.
https://brainly.com/question/4319655
#SPJ1
Please help!!!!!!!! Asap, i need to finish
The solution to the given quadratic expression is x = -1 and x = 5
Factoring quadratic equationGiven the quadratic equation below
f(x) = x^2 - 4x - 5
Factorize
f(x) = x^2 - 5x + x - 5 = 0
f(x) = x(x - 5) + 1(x - 5) = 0
(x+1)(x-5) = 0
x = -1 and x = 5
Hence the solution to the given quadratic expression is x = -1 and x = 5
Learn more on solution to quadratic equation here: https://brainly.com/question/1214333
#SPJ1
Answer:
x = -1; x = 5
Step-by-step explanation:
Standard Form of a Quadratic Function: f(x) = ax² + bx + c, where a ≠ 0
Given function: f(x) = x² - 4x - 5
⇒ a = 1, b = -4, c = -5
We are asked to solve the following function by factoring. In order to do so, let's rewrite the middle term by finding the factors that give a product of the first and last terms (a • c = -5) and give us the sum of the middle term (b = -4).
Factors that give a product of a • c: 1 • -5 = -5
Factors that give a sum of b: 1 + (-5) = -4
Step 1: Substitute f(x) = 0.
⇒ 0 = x² - 4x - 5
Step 2: Rewrite the equation with the factors.
⇒ 0 = x² + x - 5x - 5
Step 3: Factor out x and -5.
⇒ 0 = (x² + x) + (-5x - 5)
⇒ 0 x(x + 1) - 5(x + 1) [ Factor out the common factor. ]
⇒ 0 = (x - 5)(x + 1)
Step 4: Apply the Zero-Product Property (if m•n = 0, then m = 0 or n = 0)
a) 0 = x - 5 ⇒ 0 + 5 = x - 5 + 5 ⇒ 5 = x
b) 0 = x + 1 ⇒ 0 - 1 = x + 1 - 1 ⇒ -1 = x
Therefore, the missing solution for this quadratic function is x = 5.
Learn more about solving quadratic functions here:
brainly.com/question/27638369
what is the degree for the polynomial below ?
2x^(2)+3x + 1
Answer:
The exponent is 2, so the degree is 2
Please help!!! I will give u brainiest
Answer:
(2,3) ; (-2.11)
Step-by-step explanation:
Answer:
(2, 3); (-2, 11)
Step-by-step explanation:
f(x) = x² - 2x + 3
f(x) = -2x + 7
f(x) = f(x)
x² - 2x + 3 = -2x + 7
x² = 4
x = ±2
x = 2
f(2) = -2(2) + 7 = -4 + 7 = 3
x = -2
f(-2) = -2(-2) + 7 = 4 + 7 = 11
Answer: (2, 3); (-2, 11)
expand and simplify (2x+5)(3x+1`)
Answer:
6x^2 + 17x + 5
Step-by-step explanation:
(2x + 5)(3x + 1)
= 6x^2 + 2x + 15x + 5
= 6x^2 + 17x + 5
The expression (2x+5)(3x+1) is a product of two binomials. To expand this product, we multiply each term in the first binomial by each term in the second binomial, using the distributive property of multiplication.
When we multiply 2x by 3x, we get 6x^2.
Then we multiply 2x by 1, which gives us 2x.
Next, we multiply 5 by 3x, which gives us 15x.
Finally, we multiply 5 by 1, which gives us 5.
Putting these terms together gives us the expanded form of the expression:
(2x+5)(3x+1) = 6x^2 + 2x + 15x + 5
Simplifying, we can add the 2x and 15x terms to get 17x, giving us the final simplified expression:
(2x+5)(3x+1) = 6x^2 + 17x + 5.
What is the missing reason in the proof? (Reason 9)
Answer:
transitive property
Step-by-step explanation:
Generally proofs flow naturally from one step to the next. Consequently, each step usually follows from the previous step, and the Reason given justifies why that change is valid.
From statement 8, note that [tex]90^{o}=m\angle{ABD}[/tex]
For statement 9, the proof asserts that [tex]m\angle{ABC}=m\angle{ABD}[/tex]
What changed between line 8 and 9? The left side of the equation lost it's 90 degrees, and it became the measure of angle ABC.
So, what justifies changing the 90degrees into a measure of an angle (specifically, the measure of angle ABC)?
Recall from statement 3, that [tex]m\angle{ABC}=90^{o}[/tex].
The "substitution property" would be a valid reason for step 9, (but of the given options, that isn't one, so we must look for another valid reason).
Recall that the transitive property states:
[tex]\text{If }a=b\text{ and }b=c, \text{then }a=c[/tex]
There are three parts,
1. the first part needs a=b
2. the second part needs b=c
3. the third part produces a=c
Notice that in the second part, b=c, and then for the third part, on the left side, the "b" disappears, and the "a" sort of appears out of nowhere.
Statement 8 is like the second part, and statement 9 is like the third part.
Replacing "a" with [tex]m\angle{ABC}[/tex], replacing "b" with [tex]90^{o}[/tex], and replacing "c" with [tex]m\angle{ABD}[/tex], we can update the transitive property and see how it applies to our situation:
Original transitive property: [tex]\text{If }a=b\text{ and }b=c, \text{then }a=c[/tex]
Updated transitive property: [tex]\text{If }m\angle{ABC}=90^{o}\text{ and }90^{o}=m\angle{ABD}, \text{then }m\angle{ABC}=m\angle{ABD}[/tex]
In order to use the transitive property, we need the first part and the second part to be true, and then it will be a valid reason for the last part to be true. The first part was already proven back in statement 3, the second part was just proven in statement 8, so the conclusion (the third part) is valid and can be statement 9, because of the transitive property.
A 2-column table with 3 rows. Column 1 is labeled x with entries 2, 4, 5. Column 2 is labeled y with entries 5, 10, 12.5.
Use the information in the table to find the constant of proportionality and write the equation.
The constant of proportionality is
.
The equation that represents this proportional relationship is
The equation will be a linear equation from (2, 5) to (4, 10) will be y = 2.5x.
What is a function?Mathematics is replete with functions, which are necessary for the construction of intricate connections.
A 2-column table with 3 rows. Column 1 is labeled x with entries 2, 4, 5. Column 2 is labeled y with entries 5, 10, 12.5.
Use the information in the table to find the constant of proportionality and write the equation.
The equation will be a linear equation from (2, 5) to (4, 10) will be
(y – 5) = [(10 – 5) / (4 – 2)] (x – 2)
y – 5 = 2.5x – 5
y = 2.5x
More about the function link is given below.
https://brainly.com/question/5245372
#SPJ1
Answer:
2.5 and y=2.5x
Step-by-step explanation: i got that question on an edguenity assignment
4
Find the measure of x.
X
12°
X = = [?]
Round to the nearest hundredth.
The measure of x will be 18.81 units.
What are trigonometric identities?Trigonometric identities are the functions that include trigonometric functions such as sine, cosine, tangents, secant, and, cot.
The given information are;
Perpendicular = 4
Base = x
Then, Tan ∅ = Perpendicular /Base
Tan 12 = 4/x
x = 4 /0.212
x = 18.818
Hence, the measure of x will be 18.81 units.
Learn more about trigonometric;
https://brainly.com/question/21286835
#SPJ1
i do not now these questions
Using proportions, it is found that:
a) 5 people are needed.
b) Yes.
What is a proportion?A proportion is a fraction of a total amount, and the measures are related using a rule of three.
Item a:
Each person works for 32 hours, and 150 hours are needed, hence the number of people needed is given by:
150/32 = 4.6875.
However, an integer number is needed, hence 5 people are needed.
Item b:
With 30 hours, the number of people needed is given by:
150/30 = 5.
Which remains the same.
More can be learned about proportions at https://brainly.com/question/24372153
#SPJ1
PLEASE HELP 15 POINTS
Answer:
B
Step-by-step explanation:
Used elimination method.
first plugged in (0,0)which remove A,D
than saw the line is not solid so chose B
B, C and D are points on the circumference of a circle, centre O.
AB and AD are tangents to the circle.
Angle DAB = 50 degrees
Work out the size of angle BCD.
Construct OD and BD. Then, in quadrilateral ABOD, angles ODA and OBA are right angles and thus angle DOB is 130 degrees (since angles in a quadrilateral add to 360 degrees).
So, this means arc DB also measures 130 degrees. Hence, by the inscribed angle theorem, angle BCD is 65 degrees.
18.
(05.06 LC)
A librarian measured the number of young adult books in a library. The number of books in the library as a function of time (in years since 2008) is shown in the scatterplot. Choose the linear function that best describes the scatterplot relating the number of books in the library, y, to time, x. (1 point)
y = 8 − 10x
y = 8 + 10x
y = 10 − 8x
y = 10 + 8x
Answer:
y=8+10x that then answer I guess
. If we start with one bacterium and it doubles in
number every 15 minutes, HOW LONG WILL IT
TAKE for one bacterium to become one million??
Answer:
298.97 minutes
Step-by-step explanation:
2^x = 1 000 000 where 'x' is the number of 15 minute periods
x = 19.931 15 minute periods = 298.97 minutes
The nature of a graph, which has an even degree and a positive leading coefficient will be
The nature of a graph, which has an even degree and a positive leading coefficient will be up left, up right position
What is the nature of the graph of a quadratic equation?The nature of the graphical representation of a quadratic equation with an even degree and a positive leading coefficient will give a parabola curve.
Given that we have a function f(x) = an even degree and a positive leading coefficient. i.e.
y = f(x) = 2x²+ 4The domain of this function varies from -∞ < x < ∞ and the parabolic curve will be positioned on the upward left and upward right x-axis.
Learn more about the graph of a quadratic equation here:
https://brainly.com/question/9643976
#SPJ1
Question 1 of 10
Solve 10x+16 ≥ 6x+ 20.
O A. x29
OB. x≤ 1
OC. x2 1
OD. x≤ 9
Ms. Jerome wants to buy identical boxes of art supplies for her 25 students. If she can spend no more than $375 on art supplies, what inequality describes the price can she afford for each individual box of supplies,b?
The inequality 25b ≤ 375 describes the price she can afford for each individual box of supplies.
What is inequality?It is defined as the expression in mathematics in which both sides are not equal they have mathematical signs either less than or greater than known as inequality.
We have:
Ms. Jerome wants to buy identical boxes of art supplies for her 25 students. If she can spend no more than $375 on art supplies
Let's suppose b is the price of each box of supplies.
Total cost for a 25 number of boxes = $25b
25b ≤ 375
Thus, the inequality 25b ≤ 375 describes the price she can afford for each individual box of supplies.
Learn more about the inequality here:
brainly.com/question/19491153
#SPJ1
determine the scale factor for triangle abc to prime ^abc
The scale factor for triangle ABC to A'B'C' is 2
How to determine the scale factor?The complete question is in the attached image
From the attached image, we have the following corresponding sides
AC = 4 cm
A'C' = 8 cm
The scale factor is then calculated as:
Scale factor = A'C'/AC
This gives
Scale factor = 8cm/4cm
Evaluate the quotient
Scale factor = 2
Hence, the scale factor for triangle ABC to A'B'C' is 2
Read more about scale factor at:
https://brainly.com/question/10253650
#SPJ1
help please I need alot of help
Answer:
HI i no answer of this quetion but what grade are in school
pls help
Enter the equation for the graph.
Answer:
[tex]y=[1]cos([\frac{2\pi }{3}]x)[/tex]
Step-by-step explanation:
Looking at the graph, we can see the domain to be from (0 , 2π).
Now we have to find one period that corresponds to cos(x).
The half-period of cos(x) for this graph appears to be pi/3 and adding another pi/3 gets us 2pi/3 to be our cosine period.
b = 2pi/3
a is the same range as cos(x). Range: (0,0)
y = [a] * cos ([b]*x)
y = [1] * cos([2pi/3]x)
Solve the System of Equations
-5x+4y=3
x=2y-15
Answer:
Point Form:
(9,12)
Equation Form:
x = 9
y = 12
Step-by-step explanation:
Answer:
[tex]\fbox{x = 9, y = 12}[/tex]
Step-by-step explanation:
[tex]\textsf {Let's solve by substitution.}[/tex]
[tex]\rightarrow \mathsf {-5x + 4y = 3}\\\rightarrow \mathsf {x = 2y - 15}[/tex]
[tex]\textsf {Substitute for x in the first equation of the system.}[/tex]
[tex]\implies \mathsf {-5(2y-15)+4y=3}[/tex]
[tex]\implies \mathsf {-10y+75+4y=3}[/tex]
[tex]\implies \mathsf {-6y=-72}[/tex]
[tex]\implies \textbf {y = 12}[/tex]
[tex]\implies \mathsf {x = 2(12) - 15}[/tex]
[tex]\implies \mathbf {x = 9}[/tex]
[tex]\textsf {The solution is : x = 9, y = 12}[/tex]
8. Complete the table below by drawing an example of each shape.
Answer:
Please see attachment.
The first one is a quadrilateral that is not a parallelogram.
The second one is a triangle with a right angle.
Step-by-step explanation:
Hope this helps!
If not, I am sorry.
The lowest point in the United States is the Death Valley in California. Its altitude is 282 feet below sea level. Identify the integer representing the lowest point (Death Valley).
Answer:
-282
Step-by-step explanation:
Any altitude below sea level would have a negative sign in front of it.
If the triangles above are reflections of each other, then BC = to
Answer:
DF
Step-by-step explanation:
Paint a picture in your head reflecting the triangle. Just hold A and flip it so A = E , D = B
What is the measure of AC?
Enter your answer in the box.
°
Image shows a circle with angle A B C inscribed in a circle. Angle B measures 4 x minus 5.5 degrees. Arc A C measures 3 x plus 9 degrees.
Answer:
In the circle, the measure of the arc AC is 21°.
Step-by-step explanation:
Concept: We can use the Inscribed Angle theorem to get the measure of AC.
Given that the inscribed angle ∠ABC is 3x-1.5 and the Intercepted arc AC is 3x+9.
Inscribed Angle Theorem states that the measure of an inscribed angle is half the measure of the intercepted arc.
So,
3x - 1.5 = 0.5(3x + 9)
6x - 3 = 3x + 9
3x = 12
x = 4
Since the intercepted arc AC is 3x + 9, putting the value of x = 4 we get,
intercepted arc AC is 21°.
Hence the intercepted arc AC is 21°.
For more explanation, refer the following link:
https://brainly.com/question/8841969
#SPJ10
Round 508.0219 to the nearest hundredth
Answer:
508.02
HOPE THIS HELPS
Todo <3
Step-by-step explanation:
what is the product of (3a^2b^7)(5a^3b^8)
Answer:
when multiply with exponents you add so
(3a^2b^7)(5a^3b^8)=15a^5b^13
Hope This Helps!!!
What is the first step to solving the function below?
Answer:
option B, -(4x - 3)(x - 2)
Step-by-step explanation:
-4x^2 + 11x - 6
4x * x = 4x^2
x * -3x = -3x
-4x * -2 = -8x
-3 * -2 = -6
Gene has a gasoline budget of $300 per month. He uses an average of $6 of gasoline each day he drives. Which of the following equations represents how much money is left in his gasoline budget after x days of driving?
Answer:
300-6x
Step-by-step explanation:
Trust me
Given that h(-6)=0 for function h(x) = x^4 +8x³ +11x² - 8x - 12
which of the following statements are true?
A (x-3) is a factor of h(x)
B. (x+6) is a factor of h(x)
C. the remainder on division of h(x) by (x+6) is NOT 0
D. the remainder on division of h(x) by (x-3) is 0
Answer:
b
Step-by-step explanation:
when u plug in -6 u get the equation equal to 0 which means x+6 is a factor of that function.
please help me with this
The range of possible heights is given by the inequality:
d ≥ 300.125 m
How to find the possible heights of the building?
We know that the time that it takes for an object to fall from a distance d is:
[tex]t = \frac{\sqrt{2d} }{4.9}[/tex]
In this case, we know that t ≥ 5s.
Then we can solve for the minimum distance, which is given when t = 5s.
[tex]5 = \frac{\sqrt{2d} }{4.9}\\\\(5*4.9)^2/2 = d = 300.125[/tex]
So the minimum height of the building is 300.125 meters, then the range of possible heights is:
d ≥ 300.125 m
If you want to learn more about inequalities:
https://brainly.com/question/18881247
#SPJ1
