:(( Holly plays tennis on the school tennis team. She can hit a tennis ball really high in the
air. She learned that the quadratic equation y = -6x² + 36x could be used to determine the
height of a tennis ball after it was hit with a tennis racket (y = the height of the tennis
ball in feet, x = seconds after the ball is hit with the racket).
a.
How long does it take for the ball to hit the ground? How can you tell?
b.
What is the highest point reached during the flight of the ball? How do you know?
C.
When was the ball exactly 48 feet off the ground? Explain your reasoning.

  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.

48+y= ?

the y is the variable and the ? could also be a variable  

there is a website i use for textbook answers, search slader.com and look for your textbook. they have a lot of book answers for you.

answer : the point moved thirteen places to the right

on the number line, a point is moved from -8 to 5

on a number line, negative numbers on the left side of 0   and positive numbers on the right side of 0.

to move from -8 to 5 , we move to the left

start from -8 , move to -7 then -6 then -5 then -4 then -3 then -2 then -1 then 0 then 1 then 2 then 3 then 4 and finally 5

so we moved 13 placed to the right.

the point moved thirteen places to the right