What is 16.4 divided by 10

(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.

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )

If the circumference of the circle is below 72, what is the length of ab (the minor arc)