How to write an equivalent expression

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

What is the factored form of the following expressions? d^2 – 13d + 36

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?