there are three quarters, five dimes, and 12 pennies in a bath once a coin is drawn from a bad, this is not replaced if two coins are drawn at random find p(two pennies)i really need help

Can you me find the missing length. i attached an image.

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

In a column proof the right column states your reasons