What fractions would be equivalent to 4/6? would it be 2/6

Find the difference (8ab+a+2) - (3ab+6)

(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.

In the diagram below,abc is congruent to dec what is the value of x