A basketball backboard set that sold for $79 is discounted 15%. What is the sales price?

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Can someone me with these two circle theorem questions asap?

(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.