Question

tell al answers of it please​

Answer 1

Answer:

(1)Sum of 3m-n+11 and -m-11 = 2m- n __(1)

Sum of 3m-n-11 and m+11 = 4m-n ___(2)

Now substract (1) from (2)

4m-n -(2m-n) = 2m-2n

2) 2 (x^2+xy)+3-xy = 2x^2 +xy +3

if x = 5 , y = -3

2 (25) -15+3 = 38