No solution please

7 Consider functions f (x) = 2 and g(@) = - 1 . Which one of the following is the domain of their composition, (fog)(x) ? Select one alternative: Off : r ER, x / 0,a #-1} O Z : ZER,z # 0,2 7 2 O z : 2 ER,2 7 1,2 7 2 ) Ofr : x ER, z # 0,z # 1} Given the rational function f(a) = 2 + 3 2 _ which one of the following is a valid step of working when finding its inverse, f (x) ? Select one alternative: of 1(x) +3 = 2x - of-1(x) Oxf-1(1) + 31 = 2-f-1(x) of 1 (z) +3=2-f-1(1) The equation cos(50) = k for, 0