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Mindy is training to run a marathon. She runs 4 miles each day. Write an equation that would represent the number of miles m, she runs on a given day, d.

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iGreen
You know that she runs 4 miles every day, so we can set up the equation:

[tex]\sf m=4d[/tex]

For any given day you just plug that number in for 'd' and it will give you the total number of miles.