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8. Determine whether or not the following functions from real numbers to real numbers are bijections. If they are bijections, then find the inverse. If they are not bijections, then explain why not. (a) f(x) = 15-31 (b) ) = -(5x - 3) (c) f(x) = 70-3 - 5 (d) f(x) = (2) - (e) f(x) = (x + 1)(x - 1) 9. Let / and g both be functions from real numbers to real numbers. Let (t) = 3r? +6 and g(x)=-2. Define what is: (a) fog (b) gof (c) (9)