We have rational functions whenever we have a fraction that has a polynomial in the numerator and/or in the denominator. An excluded value in the function is any value of the variable that would make the denominator equal to zero. To find the domain, list all the values of the variable that, when substituted, would result in a zero in the denominator.
Sample Problems (3)
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Find the mean number of minutes per day spent on facebook: 75, 36, 0, 94, 56.
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In history, your recent test scores are 95, 86, 78, 99, and 90. If you want your average to be 90, what do you need to get on your next test?