exam Maths Puzzle Numerical Ability

The formula for calculating the amount returned for an initial deposit into a bank account or CD is given by A=P(1+r/n)^nt.
A=Return,P=Principal,r =annual interest rate(expressed

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exam Other Question
Horriable at fractions any help would be greatly appreciated. It is a fraction with the exponet being the 2/3 and 1/3.

(25x^3) 2/3
(125xy^2) 1/3

help me to solve this problem 2x + y = -6 x-3y=-6