Type the integer that makes the following addition sentence true: -7 + what = -2

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

What situation is an example of an observational study

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).