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Question: Which of the following function rules describes the number of quarts as a function of number of gallons?


A ) f(x) = x4
B ) f(x) = 4x
C ) f(x) = 2x
D ) None of the above

Steps to derive

1 Let x be the number of gallons.

2 Let f(x) be the function describing the number of quarts to x gallons.

3 One gallon is equivalent to 4 quarts.

4 x gallons is equivalent to 4x quarts.

5 The function rule is f(x) = 4x.



Hence the right answer is Option B

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