PLEASE HEL Can the following be assumed from a diagram?

Perpendicular lines and right angles

Write a corresponding real world problem to represent 2x - 125=400

(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.

Simplify. 3(4+4x) (type your answer in with no spaces)