What is the answer to this equation 0.53/(-0.35)

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

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).

Select the two pairs of figures that are similar.