Which expression is equivalent to (2 + 3) + 5?
a) 2 + (3 + 5)
b) 2(3 + 5)
c) 2 + 15
d) 6 + 5

10 - 8 = -2

  8 - 6 = -2

etc, so -2 is the common difference

step-by-step explanation:

i believe so, according to my "strange" way of figuring out weird math problems like this.