Answers
Answer:
Step-by-step explanation:
Unless we set x^2 + 8x + 15 equal to zero, we don't have an equation to be solved. I will assume that the problem is actually x^2 + 8x + 15 = 0.
The coefficients of this quadratic are {1, 8, 15}, and so the "discriminant" b^2 - 4ac is (8)^2 - 4(1)(15), or 4. Because the discriminant is positive, we know that there are two real, unequal roots.
Continuing with the quadratic formula and knowing that the discriminant is 4, we get:
-8 ± √4 -8 ± 2
x = ---------------- = --------------- , or x = -2 ± 1: x = -3 and x = -5
2 2
Related Questions
Zena saves $5 for every $30 she earns. Which of these describes the rate at which Zena saves?
A $1 saved for every $5 earned
B. $1 saved for every $6 earned
C. $6 saved for every $5 earned
D. $0.60 saved for every $10 earned
Answers
Answer:
I think it is c because yah
PLEASE HELP ME I WANT TO PASS THIS CLASS AND GRADUATE WILL GIVE BRAINLIEST
A recent study of high school students shows the percentage of females and males who have at LEAST one notation in their school record for inappropriate behavior. A simple random sample of high school students was interviewed. The students were asked whether they had a notation for inappropriate behavior in their school record. Of the 100 females, 21 answered yes, as did 145 of the 400 males.
Part A: Construct and interpret a 99% confidence interval for the difference in population proportions of females and males who have at LEAST one notation for inappropriate behavior. Be sure to state the parameter, check conditions, perform calculations, and make conclusion(s). (8 points)
Part B: Does your interval from part A give convincing evidence of a difference between the population proportions? Explain. (2 points)
Answers
lol the handwriting hurts
Answer:
other person!
Step-by-step explanation:
give the other person brainliest; hope you pass the class!
Plzzzzzz help, tysm if you do
Answers
Answer:
I think it C
Step-by-step explanation:
Let's solve your equation step-by-step.
(k−4)2=9
Step 1: Simplify both sides of the equation.
k2−8k+16=9
Step 2: Subtract 9 from both sides.
k2−8k+16−9=9−9
k2−8k+7=0
Step 3: Factor left side of equation.
(k−1)(k−7)=0
Step 4: Set factors equal to 0.
k−1=0 or k−7=0
k=1 or k=7
Answer:
k=1 or k=7
Hope this helps! :)
Square both sides:
K -4 = sqrt(9)
With the answer being a square root rewrite with a postive and negative value:
K-4 = sqrt(9)
And
K-4 = -sqrt(9)
Simplify each:
K-4 = 3
And
K-4 = -3
Solving for k in each one you get answer
C. {1,7}
What is the volume of a hemisphere with a diameter of 60.9 in, rounded to the
nearest tenth of a cubic inch?
Answers
The volume of the given hemisphere is 59131.7 inches³.
What is a hemisphere?
Hemisphere is the exact one-half of the sphere.
given, diameter of the hemisphere is = d = 60.9 inches
Therefore, radius = d/2 = 60.9/2 inches = 30.45 inches.
Hence, the volume = (2/3) × π × r³ = (2/3) × π × (30.45)³ inches³ = 59131.7 inches³.
Learn more about the volume of the hemisphere here: https://brainly.com/question/23118911
#Tag #SPJ2
what is the range of these areas 595, 675, 720, 910, 1145, 1260
Answers
Answer:
665
Step-by-step explanation:
The range is the difference between the smallest and highest numbers in a list or set. To find the range, first put all the numbers in order. Then subtract (take away) the lowest number from the highest. The answer gives you the range of the list.
Answer:
The Range is 655
Is 4.5 - (-3.5)positive negative or zero
Answers
Answer:
Positive
Step-by-step explanation:
Two minus signs = +
- - = +
Replace the -- with +
4.5+3.5 = 8
HELP HEP HELP LAST ONE OMG
Answers
Find values for p and q so that the equation has infinitely many solutions.
px - 2 = 4x + x + 9
p =
Answers
First what you should do is subtract the 2 on both sides
You’ll get px = 4x+x+7 then add the x to 4x
Px= 4x^2 +7
Dived the x on the left on both sides like this px/x = 4x^2+7/x
P= 4x+7
property . Simplify the expression 2(5+r) using the distributive property.
Answers
Answer:
2x5 = 10
1xr = 2r
Ans : 10+2r
Step-by-step explanation:
[tex]\huge\boxed{Hi\:there!}[/tex]
We are asked to simplify the given expression using the Distributive Property.
All we have to do is multiply 2 times 5 and r:
2(5+r)
10+2r
[tex]\huge\boxed{Hope\:it\:helps!}[/tex]
[tex]\huge\bold{Good\:luck!}[/tex]
[tex]\huge\mathfrak{LoveLastsAllEternity}[/tex]
Write the number in 2 equivalent forms as a fraction, decimal, or percent.
11
16
Answers
Fraction - 11/100
Decimal - 0.11
Percent - 11%
16.
Fraction - 16/100
Decimal - 0.16
Percent - 16%
The circumference of a circle is 18π in. What is the area, in square inches? Express your answer in terms of \piπ.
Answers
Answer:
A = 81π
Step-by-step explanation:
if circumference is 18π then diameter is 18 and radius is 9
A = πr²
A = 9²π or 81π
2x + y = 1 in slope-intercept form. :) also how is your day going so far?
Answers
Answer:
y=-2x+1
Step-by-step explanation:
2x+y=1
y=-2x+1
nnd my day has been pr good :)
Answer:
y=-2x+1
Step-by-step explanation:
I hope this helps. I'm doing great.
Select the correct answer.
A survey reveals that the sales of smartphones is increasing considerably. The average annual sales of smartphones, in million units, n years after the survey is conducted is modeled by function p below. The parameter b is an unknown positive base.
p(n)=1.7×b^n
Which statement is true about this situation?
A.
When the survey was initially conducted, the average sales of smartphones was 1.7 million units.
B.
If b = 1.02, the annual sales of smartphones will double in 2 years.
C.
If b = 1.45, the annual growth rate of the sales of smartphones is 145%.
D.
The average annual sales of smartphones increases by 1.7 million units every year.
Answers
Answer:
When the survey was initially conducted, the average sales of smartphones was 1.7 million units.
Step-by-step explanation:
The exponential equation is P ( n ) = 1.7 ( b )ⁿ , where n is the number of years and P ( n ) is the annual sales of smartphones and the initial sales of smartphones was 1.7 million units
What is exponential growth factor?The exponential growth or decay formula is given by
x ( t ) = x₀ × ( 1 + r )ⁿ
x ( t ) is the value at time t
x₀ is the initial value at time t = 0.
r is the growth rate when r>0 or decay rate when r<0, in percent
t is the time in discrete intervals and selected time units
Given data ,
Let the exponential equation be represented as A
Now , the value of A is
P ( n ) = 1.7 ( b )ⁿ
where , n is the number of years
And , P ( n ) is the annual sales of smartphones
Now , the value of b is the exponential growth factor
At the initial year , the number of smartphones sold is when n = 0
So , when n = 0
P ( 0 ) = 1.7 ( b )⁰
P ( 0 ) = 1.7 million units
Hence , the number of smartphones sold in initial year is 1.7 million units
To learn more about exponential growth factor click :
https://brainly.com/question/13674608
#SPJ7
Divide. (– 6t + t^3 – 4) ÷ (t + 2)
a. t^2-8t+12
b. -t^2+3t+2
c.t^2-2t-2
d. -6t^2+13t-30
Answers
Answer:
t2 - 2t - 2 or C. - Hope it helps!
jared and zach worked all day saturday mowing lawns they earned a combined of $43 how much did each boy get
Answers
Answer:
$21.50
Step-by-step explanation:
Someone Please help me
Answers
2) x= 11
3) 7/8 or 0.875
What’s 1 + 1?
A. 0
B. 0
C. 0
D. 2
Answers
Answer:
its D
Step-by-step explanation:
[tex]1 + 1 = 2 \\ [/tex]
A sofa regularly sells for $840. The sales price is$714. Find the percent decrease of the sale price from the regular price
Answers
Answer:
15%
Step-by-step explanation:
ill give brainliest
Length = 11
Width = 4
Height = 7
What is the vloume?
What is the surface area?
Answers
Answer:
volume = 308 units^3
surface area = 298 units^2
Need help need help need help need help
Answers
Answer:
Step-by-step explanation:
I believe that since both circles C & D are congruent, and TU is bisected into TW and WU, PS = 7.4/2 = 3.7
PS = 3.7
Answer:
it is 6.9
Step-by-step explanation:
i took the test
Emily bought 36 yards of fabric to make curtains.
How many inches of fabric did Emily buy?
Emily bought
Inches of fabric.
Answers
Answer:
36 yards = 1,296 inches.
What's the surface area if the radius of a cylinder is 6 and the height is 10 in ?
Answers
Answer:
A≈603.19in²
Step-by-step explanation:
sorry if it's wrong
Answer:
603.19
Step-by-step explanation:
A $60 shirt is on sale for 30% off. How much is the shirt's sale price?
Answers
Answer:39?
Step-by-step explanation:
Find the greatest common factor of these three expressions.
20w, 8w, and 28w?
Answers
Answer:
4w.
Step-by-step explanation:
The radius of a circle is 4 feet. What is the length of a 90° arc? HELP ME PLEASE
Answers
Answer:
6.3feet
Step-by-step explanation:
Given data
Radius= 4feet
The expression for the circumference of a circle is
C= 2πr
Substitute
C=2*3.142*4
C=25.136 feet
Also, a 90° arc is 1/4 of the circumference of a circle
Hence the length of the 90° arc is
=25.136/4
=6.284 feet
=6.3feet
Pls help :( (will get reported if link)
Answers
Answer:
Step-by-step explanation:
2.State whether ABC and LAED are congruent. Justify your answer.
D a. yes, by either SSS or SAS
b. yes, by SSS only
c. yes, by SAS only
d. No; there is not enough information to conclude that the triangles are congruent
Answers
Yes, Triangles ABC and AED are congruent by SSS or SAS.
What is mean by Triangle?A triangle is a three sided polygon, which has three vertices and three angles which has the sum 180 degrees.
Given that;
The triangles is shown in image.
Now,
Here, In triangles ABC and AED;
⇒ AB = AE = 7
⇒ BC = DE
⇒ AC = AD
⇒ ∠BAC = ∠DAE
Thus, The triangles ABC and AED are congruent by SSS and SAS.
Learn more about the triangle visit:
https://brainly.com/question/17335144
#SPJ2
Theo rolls a dice 306 times.
Work out an estimate for the number of times Theo rolls an even number
Answers
Please help I'll mark brainliest
Answers
A rectangular goat pen has an area of 32 square meters and a perimeter of 24 meters. What are the dimensions of the pen?
Answers
Answer:
Breadth is 4 m and length is 8m
Step-by-step explanation:
Area of the rectangle = Length * breadth
Area of the rectangular goat pen= 32 square meters
Perimeter of the rectangular goat pen = 24 meters
Perimeter of the rectangle = 2(length + breadth)
24= 2(l+b)
12= length + breadth
12- breadth = length ----------- equation A
Area = l*b
32= l*b
32= (12- b) *b
32= 12b- b²
b²-12b+32= 0------------------- equation B
Solving the quadratic equation by factorization
b²- 8b- 4b+32= 0
b(b-8) -4(b-8)= 0
(b-8) = 0
(b-4)= 0
b= 8 or b=4
As breadth is usually smaller than length then putting b= 4 in equation A
gives
12- breadth = length
12-4= length
length = 8
Hence breadth is 4 m and length is 8m
