Answer:
set middle number=x
then left side number=x-1
and right side number=x+1
(x-1)+x+(x+1)＝30
3x=30
x=10
x-1=9
x+1=11
numbers are 9,10,11
He answer is d which is 25
If a line were to be perpendicular from said points, the slope of it would be -1/28. Hope this helps!
