# Last year, Lena biked 318 miles. This year, she biked m miles. Using m, how do you write an expression for the total number of miles she biked?

Since a variable is simply a stand-in for a number we have not determined yet, it is possible to make a sum using variables and numbers to create an algebraic expression.

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The expression for the total number of miles Lena biked this year using ( m ) is ( 318 + m ).

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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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