Which of the following sets contains only rational numbers?
a. 776, pi, 25.209,and the square root of 9
b. 726,7/34,20.209, and the square root of 9
c. square root of 3,7/39,20.3, and the square root of 9
d. 726,7\34,20.209, and the square root of 5

Rational numbers are numbers which can be written as a fraction (the formula is p/q). They don't include roots we can't solve in order to get a whole number and pi.

A. 776, pi, 25.209, √9   --->    NO (because of pi)
B. 726, 7/34, 20.209, √9    --->   YES
C. √3, 7/39, 20.3, √9   --->    NO (because of √3)
D. 726, 7/34, 20.209, √5   --->   NO (because of √5

Note that √9 = 3, so it IS a rational number.

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