exam Maths Puzzle Numerical Ability

Assume that all variables are positive and multiply:
y^3/6 (y^-3/6 + 7y^3/6)

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exam Other Question

-3-(7)/3-5 is the question. i am haveing trouble with the positive and negative. when you add and subtract and when it becomes multiplacation f(x)= x^-2x+8x+4