Column a column b
1. (–22+17)+13 = –22+(17+13)
2. –(27+(–3)) = –27+3
3. 35+(–15+4) = (35+(–15))+4
4. –12+6 = 6+(–12)
a. commutative property
b. associative property
c. opposite of a sum property

1) (-22 + 17) + 13 = -22 + (17+13)
                - 5 + 13 = -22 + 30
                           8 = 8

2) -[27+(-3)] = -27+3
              -24 = -24

3) 35 + (-15+4) = [5+(-15)] + 4
         35 + (-11) = 20 + 4
                     24 = 24

4) -12 + 6 = 6 + (-12)
            - 6 = - 6

C

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.