Help Plz! Ellis is painting wooden fenceposts before putting them in his yard. They are each 7 feet tall and have a diameter of 1 foot. There are 11 fenceposts in all. How much paint will Ellis need to paint all the surfaces of the 11 fenceposts? Use 3.14 for π, and round your answer to the nearest hundredth. Provide an explanation and proof for your answer to receive full credit.

Ellis needs 259.17 square feet of paint.

Each fence post has a cylindrical format.

Ellis paints the outside of each post, which means that the surface area of each cylinder has to be found.

She paints 11 fence posts, so the total amount of paint needed is the surface area of the 11 fence posts.

Surface area of a cylinder:

The surface area of a cylinder of radius r and height h is given by:

7 feet tall, diameter of 1 feet:

7 feet tall means that

Diameter of 1 feet, radius is half the diameter, so

How much paint?

11 fence posts, so:

Ellis needs 259.17 square feet of paint.

A similar question is found at

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9