# How can a function model value?

If a value changes based on its relationship to some other value, then a function can (often) be used to model the change in that primary value.

Some examples might help.

Example 1 Suppose you purchase a $1000 Guaranteed Investment Certificate with an annual (compounded) return rate of 3% and you want to know the value of that GIC (after having held it for some number of years).

Example 2 If you drop an object the speed at which that object is falling (ignoring air resistance and assuming it doesn't hit something else) changes with the distance that the object has already fallen.

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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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