Question 789310
A small size bottle of water cost $1.99 and a large size bottle of water cost $3.49

I think the independent variable would be the size of the bottle and the dependent variable would be the amount of water the bottles hold and the price of the bottles.
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It could be either way, but it's most likely that the amount of water is the independent variable --> cost is dependent.
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Also, he is asked to solve and write as a function and in function notation???
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A function related to the the water and cost?  Without numbers for the sizes it's not possible.
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Assume small = 1 liter and large = 2 liters as an example
Assuming a linear relation between size (v) and cost (which it not realistic):
C(v) = 1.50v + 0.49  (C = cost in dollars, v = volume in liters)
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This is confusing because it's not a clearly stated problem.