This is a parabola. 20 ft represents the height of the ball. Height is represented by the letter h. Thus you need to plug 20 into the equation for h and solve for t.
The sum of an arythmetic sequence for first term, a1 and last term, an and up to the term, n is

n=58
a1=6
a58=405




sum is 11,919
Answer:
8. 10%
9. 50%
10. 15%
Step-by-step explanation:
I am pretty sure I got it right otherwise I think I have a big problem