Several college students live in an apartment building and share a washer and dryer. the cost of the rental, $20 per week, is shared evenly by the student who use the machines.

write a function that describes the weekly cost per student, in dollars, if x students use the machines.

c(x) =

, much appreciated.

(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.