[12÷(9-6)]+4×6
please help ​

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

(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.

Y=21.95x+10 y=22.45x solve by substitution