Answer:
Option A
Step-by-step explanation:
The solution is in the image
1, -1, -3
6(x+x+2+x+4)=-18
6(3x+6)=-18
18x+36=-18
18x=-54
x=-3
so x=-3, x+2=-1, and x+4=1
15 = 9m
15/9 = 9m/9
m =15/9
=5/3
=1.666667