Final answer:
The number of square feet in 1 acre is 43,560.
Step-by-step explanation:
The correct answer is b) 43,560.
An acre is a unit of area commonly used in the United States for measuring land. It is equal to 43,560 square feet. To find the number of square feet in 1 acre, you can simply multiply the number of acres by the conversion factor of 43,560.
For example, to find the number of square feet in 2 acres, you would calculate: 2 acres × 43,560 square feet per acre = 87,120 square feet.