Answer:
The rational number representing the average change in the volume of water each day is:

Explanation:
Rational numbers are those that can be represented as the quotient of two integers. That is, rational numbers can be represented by a fraction
, where a is the numerator and b is the denominator that must be other than zero. To express the set of these numbers, mathematicians use a capital Q.
In this case we know that Finn's pool leaked a total 3.5 L in 4 days, so the rate can be written as:

Now you must make this division or quotient, where the denominator will be 1 because you must know the number of liters drained per day:

So the rational number representing the average change in the volume of water each day is:
