Which of the following is a rational number? (4 points)

a. square root of 1

b. square root of 2

c. square root of 3

d. square root of 4

D is the answer because you can write it as a fraction

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.