an inv 2.2 answers

a5a) -4 a5b) -2 1/4 a5c) 1/2 a5d) -3/4

c) No, subtraction is not communitive. In other words, changing the order of a subtraction problem will change the answer. 7-(-8) does not equal -8 - 7. Addition is communitive. 7 + -8 does equal -8 + 7.