(12pts) If and are numbers, and ⋅=0, then: neither a or b must equal 0
either a equal 0 or b equal 0
a+b must equal 0

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).

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Me find the value of x each figure.