exam Maths Puzzle Numerical Ability

I need help to perform the indicated operation

f(x)=x+2 g(x)=x2 -1

I need to find (g of)(x)

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exam Other Question

prove or disprove without a calculator.

1. sin(pi/2 + theta) = cos theta The length of a rectangle is 5in. more than twice its width. If the perimeter of the rectangle is 52 in., find the width of the rectangle.