Answer:
6
Step-by-step explanation:
i belive its six
B=-2+5 collecting like terms
B=3 answer
-is a 4x ala 2 -3x -9
-or 4x2 -3x1-9x
m = 5
n = 12
Opposite sides in a parallelogram are equal
so:
m+1 = 6
m = 6-1
n is opposite to 12 so n = 12