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Elden [556K]
3 years ago
15

A public interest group hires students to solicit donations by telephone. After a brief training period students make calls to p

otential donors and are paid on a commission basis. Experience indicates that early​ on, these students tend to have only modest success and that 80​% of them give up their jobs in their first two weeks of employment. The group hires 7 ​students, which can be viewed as a random sample.
Mathematics
1 answer:
IceJOKER [234]3 years ago
8 0
I need help with the answer?
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enelope determined the solutions of the quadratic function by completing the square. f(x) = 4x2 + 8x + 1 –1 = 4x2 + 8x –1 = 4(x2
Marat540 [252]
The correct question is
<span>Penelope determined the solutions of the quadratic function by completing the square.
f(x) = 4x² + 8x + 1
–1 = 4x² + 8x
–1 = 4(x² + 2x)
–1 + 1 = 4(x² + 2x + 1)
0 = 4(x + 2)²
0 = (x + 2)²
0 = x + 2
–2 = x
What error did Penelope make in her work?

we have that
</span>f(x) = 4x² + 8x + 1
to find the solutions of the quadratic function
let
f(x)=0
 4x² + 8x + 1=0

Group terms that contain the same variable, and move the constant to the opposite side of the equation

 (4x² + 8x)=-1

Factor the leading coefficient 

 4*(x² + 2x)=-1

Complete the square Remember to balance the equation by adding the same constants to each side.

 4*(x² + 2x+1)=-1+4 --------> ( added 4 to both sides)

Rewrite as perfect squares

4*(x+1)²=3

(x+1)²=3/4--------> (+/-)[x+1]=√3/2

(+)[x+1]=√3/2---> x1=(√3/2)-1----> x1=(√3-2)/2

(-)[x+1]=√3/2----> x2=(-2-√3)/2

therefore

the answer is

<span>Penelope should have added 4 to both sides instead of adding 1.</span>
6 0
3 years ago
Read 2 more answers
Subtract −b+3 ​​from −11b−4 ​. What is the answer?
monitta
-11b-4 - -b+3 = -10b-7
5 0
3 years ago
Read 2 more answers
Please help me fast:
Fiesta28 [93]

Answer:

45 − x % ∗ 45 = 38.25

− 45 x /100 = 38.25 − 45

− 45 x /100 = − 6.75

x = 6.75 ∗ 100 /45

= 15

8 0
3 years ago
Read 2 more answers
Super legend this is still a hard question but im trying to get rid of my points i like to stay at the bottom of the point list,
Alla [95]
$3 went to the men and and $2 to the bellboy. That's $5 in total, which is what the bellboy was supposed to give the men. So the $1 is with one of the men.
7 0
3 years ago
Makayla conducted an experiment on the 7th grade class. She took the resting heart rate of 20 of her classmates and then had the
Gekata [30.6K]

The mean absolute deviation will show us on average how far each of all the data points from the graph that Makayla collected are from the mean. To calculate it you simply have to use the formula shown in the attachment. It is very easy but will take you like 5 minutes to solve. Use it for each data set.



Data Set’s

Resting Heart Rate

Heart Rate After Walking One Mile


<span>I hope this helps, Regards.</span>

3 0
3 years ago
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