Question #5da9e

1 Answer
Ricardo A.
Aug 30, 2017

#x=45 - m#

Explanation:

First, let's list what we know:

a) The class has 45 minutes;

b) the number of minutes that have gone by (m) is a number that is between 0 (when the class hasn't started yet) and 45 (when the class ends).

We want to know how many minutes are left in the class, or, in other words, how many minutes are left when we subtract m minutes form 45 minutes. Using x to represent the result, that looks like this:

#x=45 - m#

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