One number is four more than four times another. If their sum is decreased by six, the result is twenty-eight. Find the numbers.
1 answer:
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For this case we must find the value of the variable "x" of the following equation:
We apply distributive property to the terms within parentheses:
We subtract 18 from both sides of the equation:
We divide between 12 on both sides of the equation:
Answer:
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