exam Maths Puzzle Numerical Ability

Such units refer to the diag of the screen, A 25 in t.v set also has a width of a 20 inches what is the height

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exam Other Question
Can you help??? Simply the following:
(3a^2)^-2

and
6x^-2 divided by x^-3

Thanks for helping!! graph the functions f(x)=-2x-5