exam Maths Puzzle Numerical Ability

Simplify, answering with positive exponents:

(a^-2/7)(a^3/7)

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exam Other Question

if 3√x^6 + 3√8x^3 + 3 √1=0, then x =
A -1
B 0
C 1
D 2
E 3 How do I change the fraction 3/5 to a decimal?