Answer
A)$12$
Work Step by Step
The equation is y=1.75m. "M' represents the amount of miles Luis ran, "y" means the amount of money that was raised. The value of "y" was given to us: 21 dollars. Now plug it into the equation: 21=1.75m. Divide 1.75 on both sides to get the "m" value alone.
$$\frac{21}{1.75}=\frac{1.75}{1.75}m$$ $$m=12$$
