exam Maths Puzzle Numerical Ability

Can someone please help:

1. (2/3X^7 y ^-1)^2

2. (-2)^3 X^4(yz)^2
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3^2 xy^3 2^4

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exam Other Question

Solve the following quadratic equation

(x-5)(x+2)=18

Thank you for your help [(5+4)x3] x 2 = 9 x(3x2)

is this associative law of multiplication?

it looks like we are doing (a x b) x c = a x (b x c)