What 22 is 44% of what number

Does the point (1, sqrt 7) lie on circle shown.

(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.

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2