If your body develops a charge of -20 uC (microcoulombs), how many excess electrons has it acquired? Express your answer using two significant figures.

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

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).

What is the result of adding the system of equations? 2x+y=4 3x-y=6