Explanation
The first step in solving this problem is to convert all the numbers to the same standard of measure. If you convert the inches to feet, 8 inches + 10 inches = 18 inches. Since 12 inches = 1 foot, then 18 inches converts to: 1 foot, 6 inches = 4 feet + 6 feet + 1 foot + 6 inches = 11 feet, 6 inches = 132 inches + 6 inches = 138 inches