Question

please tell me the answer step by step urgent​

Answer 1

Step-by-step explanation:follow me

a. ab +(-15) ab+-5ab+2ab

-14ab -3ab

-17ab

Answer 2

Step-by-step explanation:

(a)-15ab-5ab+2ab+ab,

= -20ab+3ab

=-17ab

(b)2r-r=r,2s-s=s,-1+1=0,

= r+s

(c)5t^2 s^2-t^2s^2+7t^2 s^2-2ts+5ts+5c^2+1,

=11t^2 s^2+3ts+5c^2+1