Subtract:

(a) 12y from 19y

(b) 6z from 5z

(c) 10p from 20p

(d) 13m from 23m

(e) 48n from 50n

Solve:

(a) 6x + (9x − 2x)

(b) 11y + 2y + 3x

(c) 11z + 3z + z

(d) 8ab + (−3ab)

(e) 3x − 4x + 7x

(f) 35b − (16b + 9b)

(g) (9a − 3a) + 4a

Divide:

(a) 12x ÷ 2x

(b) 24ab ÷ 8a

(c) 9x ÷ 3y

(d) 25a² ÷ 5a

(e) 49xy ÷ 7xy

Find the value of:

(i) 3x + 2y when x = 3 and y = 2

(ii) 5x - 3y when x = 2 and y = 5

(iii) a + 2b - 5c when a = 2, b = 3 and c = 1

(iv) 2p + 3q + 4r + pqr when p = 1, q = 2 and r = 3

(v) 3ab + 4bc - 5ca when a = 4, b = 5 and c = 2