Write the first four terms of the sequence defined by
5, if n = 1
an =
lan-1-5, if n> 1
A 5, 0, -5, -10
B 5,0, -5, -25
C5, 0, -5, -50
D5, 0, -10, -100

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