Algebra homework on functions and exponential growth and decay

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

(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.

An octagonal prism has jow many lateral faces?