If the ball hit the ground it means that its height is equal to 0. In order to find the time after the ball will hit the ground, we need to find the solution of the equation h(x)=0 which is different to 0.

-4.9x^2+21.3x=0
x(-4.9x+21.3)=0
-4.9x+21.3=0
x=21.3/4.9 = 4.3469 seconds

4 0

2 years ago

Kristy ran a mile in 6.58 minutes. She ran her second mile in 7.15 minutes. What was the time difference between her first and s

Veseljchak [2.6K]

Answer:

17 seconds

Step-by-step explanation:

7.15 minus 6.58 is .17 or 17 seconds

6 0

3 years ago

Read 2 more answers

(½ point for model; ½ point for correct simplified expression) (8x + 2) + (-9x + 7)

Alexxx [7]

Answer:

Simplified= −x+9

Step-by-step explanation:

5 0

2 years ago