HELP PLSSS ON THESE 4 QUESTIONS

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

(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.