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: 20
Step-by-step explanation: since i helped can i have brainlist plesa :D
The anwser is b because sum means add
The number of calculators
= Number of boxes * calculators in each box
=18* 12
= 216 calculators
Answer:
27 and 40
Step-by-step explanation:
