Answer:
The square root of -1 is i
1.
Height h = 240 feet
We insert it into formula.

Now we solve this for t:

We have two answers as the rocket will pass this height on it's way up and down.
2.
Height h = 0 feet
We insert it into formula.

Now we solve this for t:

We do not consider solution -1 as the time can not be negative. Our solution is 5s.
3.
Height at bottom of hill h = 0 feet
We insert it into formula.
It is probably best to measure a volume of this size in Liters. This is a metric unit. There are 1000 liters in one cubic meter.
The best estimate would be 35%.
7 out of the 20-coin sample were from before 1980; 7/20 = 35%.
Answer:
134.844%
Step-by-step explanation: