convert 50ft to inches which is 600
then divide 600 by 75 = 8 rotations
For this case we have that the equation that describes the height is:
Where,
v: initial speed
c: initial height
Substituting values we have:
Then, to find the time, we use the quadratic formula:
Substituting values we have:
Rewriting:
We discard the negative root because we want to find the time.
We have then:
Answer:
D. 
The conclusion is that since the value of 0.028 is less than 0.05 so we reject the null hypothesis at 5% level of significance and conclude that the mean of the difference in SAT writing scores for all students who take SAT prep class is equal to 0.
<h3>What is a null hypothesis?</h3>
A null hypothesis is a hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling error.
Here, the effect of a one-day SAT prep class at a 5% level of significance was assessed. Since the value of 0.028 is less than 0.05 so we reject the null hypothesis at 5% level of significance and conclude that the mean of the difference in SAT writing scores for all students who take SAT prep class is equal to 0.
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