Question

Hi there, can someone please help me with my math homework. It’s only the blue highlighted sums I need. Please help I’ll really appreciate it.

Answer 1

(15)

`-mn(2m+7n)`

(16)

`x^(3)`

(17)

`9x^(3)`

(18)

`6x^(5)`

(19)

`21m^(5) n^(3)`