Please answer this correctly

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

(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.