Need this ASAP please

If f(x)= 3x+6 which of the following is the inverse of f(x)

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.