X - 1 + x + x + 1 = 345
Consecutive means that each member differs by one. Put another way you add one to the previous number to get the next number.
3x = 345
x = 115
x - 1 = 114
x + 1 = 116
You can use the midpoint formulae as I have in the picture below
I think it's B because it's a right angle and it's 90 + 25 =125 hope this helps,
