Between 1998 and 2018 inflation for prices of goods and services have been about 51%

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 does independent variable and dependent variable mean in math?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab