Question

Which of the following is the most appropriate unit to describe the rate at which water flows over Niagara Falls?

Day per billion gallons, because the independent quantity is volume of water in billion gallons and dependent quantity is time in days

Billion gallons per day, because the independent quantity is volume of water in billion gallons and dependent quantity is time in days

Billion gallons per day, because the independent quantity is time in days and dependent quantity is volume of water in billion gallons

Day per billion gallons, because the independent quantity is time in days and dependent quantity is volume of water in billion gallons

Answer 1

The answer is C, "Billion gallons per day, because the independent quantity is time in days and dependent quantity is volume of water in billion gallons"

Explanation:

Answer 2

I'd have to say the second option, "Billion gallons per day, because the independent quantity is volume of water in billion gallons and dependent quantity is time in days"