8.4y−3.6y=48.96 i need help

What is the reflection image of (5,-3) across the line y = -x?

Is this a polynomial function? i need to know 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.