Plz and show work. if you show work i will make you brainiest.

Landon wrote that 3−2.6=4. which statement about his answer is true?

The surface area of the triangular prism is .

(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.