Final answer:
By substituting t with 5 seconds in the equation h = -16t² + 72t + 100, we find that the height of the coin at 5 seconds is 60 feet.
Step-by-step explanation:
To find the height of the coin at 5 seconds using the given equation h = -16t² + 72t + 100, we simply substitute the value of t with 5 seconds.
The calculation will be as follows:
h = -16(5)² + 72(5) + 100
h = -16(25) + 360 + 100
h = -400 + 360 + 100
h = -40 + 100
h = 60 feet
Therefore, the height of the coin at 5 seconds is 60 feet.