The first way is to multiply 0.95 by 4 since each of them got a drink (Ronald+3 friends is 4 people.) This is 3.8. Now, add 12.64 to 3.8 because that is the total cost: 16.44. Because they equally split the cost, do 16.44/4: this is 4.11.
The second way is to divide 12.64 by 4. This is 3.16. We already know they each paid 0.95 for their drink, so it is already divided for us. Then, add 0.95 to 3.16, which is also 4.11.
C, because the independent variable would be the variable that is changing -- in this case, the temperature. The dependent variable changes according to the independent variable, and is called so because it depends on the temperature of the pool.
