Questions on a pop quiz are worth 4 points for each multiple choice question, `m`, and 6 points for open-response question, `r`. Write an expression to determine the total number of points on the quiz in terms of `m` and`r`.
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The total number of points on the quiz can be determined by multiplying the number of multiple choice questions by the point value of each multiple choice question and adding the product to the product of the number of open-response questions and the point value of each open-response question.
The expression to determine the total number of points on the quiz is:
`total points = (4 * m) + (6 * r)`