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------------------------------------------------ A teacher calculates the course grade by adding the four semester grades 91, 92, 93, and 94, then adding six times the final grade, $ f $, and dividing the total by 10.

Write an expression for calculating the course grade:

A. Course Grade = $\frac{91 + 92 + 93 + 94 + 6f}{10}$

B. Course Grade = $\frac{91 + 92 + 93 + 94}{10} + 6f$

C. Course Grade = $\frac{91 + 92 + 93 + 94 + 10f}{6}$

D. Course Grade = $\frac{91 + 92 + 93 + 94 + f}{6}$

The representation of the grade calculation based on the given criteria is 'Course Grade = (91 + 92 + 93 + 94 + 6f) / 10'. This corresponds to option a in the given choices.

Explanation:

The question is asking for an expression to calculate the course grade based on the provided information. The teacher calculates the course grade by adding four semester grades, which are 91, 92, 93, and 94. Then, the teacher adds six times the final grade, denoted as 'f'. Lastly, the teacher divides the total by 10.

The expression for calculating the course grade is (91 + 92 + 93 + 94 + 6f) / 10

From the provided choices, the correct one that matches this description is: Course Grade = (91 + 92 + 93 + 94 + 6f) / 10, so the answer is option a.

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