When the ball hits the ground, the height is 0.
0 = 100 - 16t²
0 = (10 - 4t)(10 + 4t)
0 = 10 - 4t or 0 = 10 + 4t
4t = 10 or -4t = 10
t =
or t = 
Time cannot be negative (unless you have a time machine) so disregard 
Answer: t =
= 2.5 seconds
Answer:
Think it's 109.33
Step-by-step explanation:
look it up brodie
The standard deviation is 1, I believe...
I put in a graph and the equation
y<2x-5
y>-3x+1