Answer:
The domain of a function is the set of all possible inputs for the function. For example, the domain of f(x)=x² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0.
Answer:

Step-by-step explanation:

When there is a ( - ) in front of an expression in parentheses , change the sign of each term.
Also, remove the parentheses
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Collect like terms
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Answer:
b
Step-by-step explanation:
d is your inital amount. Then you spend $7, so you subtract 7. That is greater than or equal to 50.