Combine Like Terms 1) 2X5 + 5X3 – 4X5 – 5X3 2)2a - 5b – 8c – 2a -5b + c
3)4x -8y + 4z – 6x – 2y – z
4)6x9 – 3 x6 – 8y10 + y – 6x9 -3x6 + y10 -2y
5)-5a7 – 2a – 7b8 + b – 2a7 – 5a +7b8 – 4b
6)– 2a -7b – 4c – d -2a +7b +c – d
7)-9a6 + a5 – b7 – 8b4 + a6 – 3a5 – b7 + b4

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

(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.