The ball hits the ground when the height h(t) = 0 , so
-16t^2 + 80t = 0
-16t(t - 5) = 0
t- 5 = 0 or -16t^2 = 0 ( here t = 0 which corresponds to when ball is thrown)
t - 5 = 0 gives:-
t = 5 seconds (answer)
Answer:
20 votes
Step-by-step explanation:
You start with the percents: You always start with 100%
100-5=95
Then you multiply
95 x 4
4 is how many votes he received the 2nd time
95 x 4= 380
Then you subtract
380-360= 20
Your Welcome :)
Answer:
A
Step-by-step explanation:
Photomath, lol
Step-by-step explanation:
Area = 8 × 5
Area = 40^2
Perimeter is the length around the edges
Therefore it is 8+8+5×5 (since there are 4 edges)
Perimeter = 2×8 + 2×5
= 40 + 10
= 50cm
