There are two ways to do this problem. First you can convert feet to inches by multiplying feet by 12 and adding that total to the number of inches like this
2 feet 8 inches =
2 feet x 12 = 24 inches + 8 inches = 32 inches
5 feet 3 inches=
5 feet times 12 = 60 inches + 3 inches = 63 inches
32 inches + 63 Inches = 95 inches
If you want the answer in feet then you can divide 95 inches by 12
12 goes into 95 7 times with a remainder of 11
7 feet 11 inches
You can also add the number of feet together 2 feet + 5 feet = 7 feet
and the number of inches together 8 inches + 3 inches = 11 Inches
You get the same answer.