Two climbers are at the top of mount everest, the highest peak in the world. they begin their descent and climb at an average rate of 280.7 feet per hour, heading down to the base. after two days, they've completed 7 hours of climbing. which rational number represents the change in their altitude (in feet)?

(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.