6 has the same place value as the 7
Here are all of the answers for the problems showed...
10- 8.72=8.720
13- 2.573<2.753
16- 2.97, 2.714, 2.09, 2.007
I think you forgot to mention Susan's current age if not:
x+5
x-4
6x
1 yd equals 3 feet. 1 yd equals 36 inches.