Answer:
x = ± 
Step-by-step explanation:
Given
mx² = f ( isolate x² by dividing both sides by m )
x² =
( take the square root of both sides )
x = ± 
In order to find the maximum of the function, we have to find the roots of the first derivative.

This gives us the time at which the ball reaches its maximum height.
We don't know s. We can find it because we know that at t=0 the ball is on the ground and its height has to be zero.

Finally, we can find the maximum height:

The answer is
C.
There would be 18 students.
Work: 22 1/2 or 22.5 and 1 1/4 or 1.25
So, 22.5/1.25cups equals 18 students
The least number of points Jared needs to score is 53.
Jared already has an average of 86%. He want to have an overall average of 88. His exam is worth 20% of the total grade. This information can be modelled as:
(0.8 x 86%) + (0.2 x a) = 88%
a = score in the exam.
68.8 + 0.2a = 88%
Combine similar terms
0.2a = 88 - 68.8
0.2a = 19.2
a = 19.2 / 0.2
a = 96%
Jared has to score 96% on the exam.
The second step is to determine which score would give 96%
x / 55 = 96%
x = 55 x 0.96
x = 52.8
x = 53
To learn more about average score, please check: brainly.com/question/9133059