exam Maths Puzzle Numerical Ability

8-[3-2(9-7)-12]-11=
simplify by using order of operations, I am confused any help I will deeply appriciate

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Checking my math: Can someone shows the steps and solution? Thanks

Simplify using the power rule.

5y^3(y^5)^2
____________
10y^5(y^2)^6
A rectangle is three times as long as it is wide. If its length and width are
both decreased by 2 cm, its area is decreased by 36cm squared. Find its orginal dimensions