Question

Which expression results in a rational number

Given

A=√12

B= 4√3

c=√49

D=√100

(1) A+B

(2) B+C

(3) D+A

(4) C+D

Answer 1

C and D give rational numbers, as the square root of 49 is ±7 and the square root of 100 is ±10.