[2 marks] Show thatx-t-x [4 marks] Suppose g : A B and f: B C where A { 1,2,3,41, B { a,b,c}, c= { 2,7, 10}, and f and g are defined by g 1,b),(2,a),(3,a),(4,b)) and f (a,10),(b,7),(c,2). Find fo g andf1. 4 marks] Find fo g and g f, where fx) x+2 and g(x) -x+3, are functions from R to R. [2 marks] For the function f: R R where f(n) = 2n, does an inverse exist and, if so, what is it