186/3=62
a possible answer could be 60, 62, 64.
195 +15d=360
answer
subtract 195 from each side
15d=165
d=165/15=11
He would need to walk 11 dogs
When Completing the square you take the 'b' term and divide it by 2, then square it.
3/2, (3/2)^2 = 9/4
Letter C
