a. A' means the complement with respect to Z? If so, then
To know A' you need to write all the elements in Z that are not in A.
b. All the subsets of B, is knowed as P(B),
c. (Add to A the elements of B, or equivalently add to B the elements of A)
d. express informally speaking the elements that have in common, but there is no element in common, so
Answer:
ITS
Step-by-step explanation:
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I believe the answer for this is D
Subtracting 10x from the given equation gives
120 = 15x
Then dividing by 15 gives
8 = x
Zorah will have to play 8 hours in order to break even (cover her expenses exactly).