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Answer: third option
Step-by-step explanation:
To solve the problem you must apply the proccedure shown below:
- Descompose the numerator and the denominator of the given fraction into its prime numbers:

Then you can rewrite:

Then:

Therefore, the answer is: 
10 quarts = 40 cups
Explanation: Each quart is equal to 2 pints. So 10 multiplied by 2 is 20 pints. Each pint is equal to 2 cups. So 20 multiplied by 2 is 40.
In this relation we have two ordered pairs:
( 5, 7 ) and ( 5, 8 )
For x = 5 : f ( x ) = 7 and also for x = 5, f ( x ) = 8. This is not possible for a function.
Answer:
b ) No. The relation is not a function.