Solve for a.
16a + a - 4a - 13a + 3a = 12
A. a = 12
B. a = 3
C. a = 0 D. a = 4

16a + a - 4a - 13a + 3a = 12

3a = 12

D. a = 4

the figures below are made out of circles, semicircles, quarter … 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). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation: