7. If f(x) = x and g(x)=x -1, find the following: a) f(x) g(x) [2] b) g(f(x)) [2] c) g(f(0)) [1] 8. For the function f whose graph is given, state the value of each quantity, if it exists. If it does not exist, explain why. [4] a) limf(x) b) limf(x) -4 -2 c) limf(x) 2 d) f(3)