exam Maths Puzzle Numerical Ability

Please help to :

Evaluate

a^2 - b^3(a - b) if a = 1/3 and b = - 1/2

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exam Other Question

solve each system:

2x- y+3z=-14
3x-2y+4z=11
5x+ y-6z=-32

i am very confused on how to solve this...please help! A girl has ten coins, all nickels and dimes, with a total value of 70 cents. Find the number of each kind of coin.