The number of runners who finish the marathon is 320. Runners donate $2.50 for each mile they run. How much money is donated? Explain.

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

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).