Add the following lengths: 4'9" + 7"

5'4"

Step-by-step explanation:

In terms of height, the apostrophe (') stands for feet and the quotation mark (") stands for inches.

Your first term includes 4 feet and 9 inches. There are 12 inches in a foot, so we can simplify this as being 57 (48+9) inches.

Your second term includes 7 inches.

Add your two terms (57 and 7) together, and you have 64 inches.

Again, there are 12 inches in a foot, so to convert 64 inches to feet, count how many times you can put 12 into 64 without surpassing 64.

12 / 24 / 36 / 48 / 60

This will result in 5 times, so you have 5 feet and 4 inches left over.