# Will is 4 years older than Mike. Together, the sum of their ages equals three times Mike's age. How old is each person?

Mike is 4 and because Will is 4 years older Will is 8.

The sum of Mike's and Will's age can be written as

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Mike is ( 8 ) years old, and Will is ( 12 ) years old.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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