A force of 72 pounds stretches a spring 2 inches. how much force is required to stretch the spring 3 inches?

108 pounds

Step-by-step explanation:

First you find out how much can stretch a spring 1 inch.

72/2 = 36

36 pounds can stretch a inch spring, so know you need to find out how many pounds can stretch a 3 inch spring.

36*3 = 108

So 108 pounds can stretch a 3 inch spring.