Answer:
b = 
Step-by-step explanation:
8 pens costs 1.09
1 pen costs 1.09/8=0.13625
We are asked to determine the formula that can be used in solving the surface area of a cylinder given that one end is open while the other end is closed. The answer to this problem is Surface area = 2*pi*r*h or SA = 2pi*rh where "pi" is equivalent to 3.1416, the "r" represents the radius of the cylinder while the "h" represents the height of the cylinder.
