On fridays at the ballpark, a cup of soda costs $3, and each refill costs $0.60. if x represents the number of refills, which of the following equations represents the amount a person spends on soda?

In order to make an equation for the sodas, We first need to look at what we know. We know that a cup of soda initially costs $3. Now we know that our variable x is .60.

We now have to put it into an equation where 3 is a solid term while .60 can change. This then can be represented by:

.60x+3=y 
Y is your total that a person spends on soda.