1. 3(3x - 5y - 2) -2(7 + 5x - 8y) = 2. 2w(3x - 4z) +8wz =
3. 18xy - 3x(4y) - 2x . 2y =
4. Subtract 8r - 5w from 7w + 12r.

5. a) Simplify the expression.
2(4b - 7c) -3(2c - 3b)
b) Hence, find the value of the expression when b = - 6 and c = 1/2.
6. 18y - 27xy =
7. 21xz + 24yz - 14x - 16y =
8. 2x+1/ 3 + x-3/ 4
9. The sides of triangle ABC are AB = (3x + 4) cm, BC = (4x - 5) cm, and CA = (x + 13) cm.

a) Express the perimeter of triangle ABC in term of x.

b) Factorize the answer.

c) A square PQRS has the same perimeter as triangle ABC. Express the length of one side in term of x.

d) Find the perimeter of triangle ABC when x = 7.