Catherine is considering two new cell phone plans. She doesn't want to spend more for minutes she won't use. One plan allows up
1 answer:
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First of all, we can observe that
So the expression becomes
This means that the expression is defined for every
Now, since the denominator is always positive (when it exists), the fraction can only be positive if the denominator is also positive: we must ask
Since we can't accept 3 as an answer, the actual solution set is