(a) is the first one. 48 I would say 8 mins
(b) is the second one. 10 I would say is 96
The way I figured this one out was saying that if it takes 2lbs to stretch it to 12 inches and 5lbs to stretch to 18 inches that means that 3 additional pounds = 6 inches. Therefore, each additional pound is 2 inches. We know already that with 2 lbs it was 12 inches in length and we can also say that 2 lbs = 4 inches. So subtract 4 from 12 and you end up with the answer of 8 inches.
The slope is 1/3 because in order to get from point (3,1) to (6,2) you need to rise 1 and go over 3
