Lisa has 21 books because you add 1 to Felix because she Lisa had 1 more than him & Joe has 10 than Lisa .
The answer is 9 because 42+9=51
x-7> -9
x> -2 (add seven to nine)
The problem here is incomplete, but I found a problem online that must be the same to this. The picture is attached. The figure shown is a stemplot. The numbers to the left of the bar is the stem, while numbers to the right are the leaves. So, if you want to find 10.1%, find the row where the left number is 10. Then, find the corresponding 1 among the numbers to the right. That is 10.1% for the older folks living in Colorado.