Section: Math

47) If a=^6a2/₁₈ and a is a non-zero integer, which of the following is equivalent to a?

1. 5a
2. 5√a
3. √3a
4. 3√a

STEP ONE. Cross-multiply (18a=6a²).
STEP TWO. Reverse (6a²=18a). 
STEP THREE. Divide by 6 (a²=3a). 
STEP FOUR. Take the square root of a (3√a). Answer 4.