The quadratic model f(x)=-5x^2 +200 represents the approximate height, in meters, of a ball x seconds

x = 5.477 s

Step-by-step explanation:

Your full question can be found in the image below

We can easily solve this question by using a graphing tool or calculator to plot the equation

f(x)=-5x^2 +200

See second attached picture

The ball is 50 meters from the ground when

50 =-5x^2 +200

-150  =-5x^2

x^2 = 30

x = 5.477 s

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.