How to find the domain of a function algebraically.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Find the dimensions of the circle. area = 64π in.² r= in.

M? aoc=96 ? space, m, angle, a, o, c, equals, 96, degree \qquad m \angle boc = 8x - 67^\circm? boc=8x? 67 ? space, m, angle, b, o, c, equals, 8, x, minus, 67, degree \qquad m \angle aob = 9x - 75^\circm? aob=9x? 75 ? space, m, angle, a, o, b, equals, 9, x, minus, 75, degree find m\angle bocm? bocm, angle, b, o, c: