Round 18.90843 to the correct decimal place so that it deals with money.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

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).