John walks m miles each week. Marie’s distance can be found by using the expression : 3m + ½ If John walks 7 miles in one week, how many miles does Marie walk?

21.5 Miles or 21 ½ Miles

Step-by-step explanation:

Plug in 7 as m to 3m + ½.

Then, I get 3(7) + ½.

That concludes to 21 + ½

Add the ".5" or "½" at the end

So, answer is you get is 21.5 of 21 ½