Question

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

Answer 1

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 2

those are the answer choices

Answer 3

Well, a RATE is generally some MEASURE per unit of TIME. Does that help you eliminate two of the choices?

Answer 4

im thinking it would be Day per billion gallons, because the independent quantity is time in days and dependent quantity is volume of water in billion gallons.

Answer 5

But you want a RATE of the FLOW of the water.

A RATE is usually something that depends on TIME. E.g, time is INDEPENDENT, and the RATE DEPENDS on how much time has passed.

Like, driving a car - miles per hour.

pay rate - $ per hour

Answer 6

so

Answer 7

maybe the first choice

Answer 8

You want the RATE at which the WATER FLOWS. So HOW MANY GALLONS for so many DAYS.

Answer 9

billion gallons for days

Answer 10

Compare it to driving a car: you measure rate in MILES per HOUR, right? not HOURS per MILE.

Answer 11

yes

Answer 12

Yes, gallons/day is an appropriate rate. Now what is dependent and what is independent?

Answer 13

independent- time in days
dependent- volume of water??

Answer 14

Yes.

Answer 15

so C is the answer