if x20 17. Given the function g defined by g(x) = (-x if xen evaluate each of the following functions. [3] a) g(3) b) 8(-2) c) 8(0) 18. Determine whether fis even, odd, or neither even nor odd. Justify. f(x) =x+x-1 [2] 19. Given f(x)=1-x' and g(x) =2x+1, find the following. a) f(x)-g(x) [2] b) f(x)g(x) [21