Simplify 3x + 2y + x + 5y

(a)  

Expand: 3(y + 4)

(a)  

Factorise: 6x + 12b

(a)  

Expand and simplify: 3(2x + y) + 2(5x + 3y)

(a)  

Factorise:

(a)  

Expand: 3(2c + d) -2(c +d)

(a)