For each subset it can either contain or not contain an element. For each element, there are 2 possibilities. Multiplying these together we get 27 or 128 subsets. For generalisation the total number of subsets of a set containing n elements is 2 to the power n.
Solve the following similar fraction. 3/4 + 1/4=?
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12. 
r - 3 = 4(-5)
r - 3 = -20
r = -20 + 3
r = -17
13.
6(r - 2) = -7(5)
6r - 12 = -35
6r = -35 + 12
6r = - 23
r =
r - 3 = 4(-5)
r - 3 = -20
r = -20 + 3
r = -17
13.
6(r - 2) = -7(5)
6r - 12 = -35
6r = -35 + 12
6r = - 23
r =