Evaluate the following expression for x = 2 and z = 4. 4x + (7 − z) − 6 = ?

This is so hard and it’s for a test

Can someone me out here number 4 plz

(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.