It takes 4.3 seconds for the rocket to return to earth.
The equation is:

where -9.8m/sec² is the acceleration due to gravity, v₀ is the initial velocity, and h₀ is the initial height. We will go from the assumption that the rocket is launched from the ground, so h₀=0, and we are told that the initial velocity, v₀, is 42. This gives us:

We will use the quadratic formula to solve this. The quadratic formula is:

Plugging in our information we have:

x=0 is when the rocket is launched; x=4.3 is when the rocket lands.
Well first find out how big a penny is then divide that by 93,000,000
Answer:
Last option: x = -5
Step-by-step explanation:
-3x + 25 = 40
-3x = 40 - 25
-3x = 15
3x = -15
x = -5
Answer:
11
Step-by-step explanation: