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15. Find formulas for fog and go f, and state the domains of the compositions. f (x) = x-, g(x) = v1 -x f (x) = vx -3, g(x) = vx2+3 1 +x f (x) = 1 -x -. g(0) = 1 - X f (x ) = X 16. Find a formula for fogoh. f (x) = x- +1, g(x) = -, h(x)=x f(*) = g (x) = Vx, h(x)= 1+x19. Classify the functions whose values are given in the accom- panying table as even, odd, or neither. -3 -2 -1 0 2 3 F(x) 5 3 2 3 -3 5 8(x) 4 1 -2 0 2 -1 -4 h(x) 2 -5 8 -2 8 -5 2 20 Complete the accompanying table so that the graph of y = f(x) is symmetric about (a) the y-axis (b) the origin. -3 -2 -1 0 3 f(x) -1 0 -5