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The formula for spring factor in a shoe ...

The formula for spring factor in a shoe insole is `(w^(2)+x)/(3)`, where w is the width of the insole in centimeters and x is the grade of rubber on a scale of 1 to 9. What is the maximum spring factor for an insole that is 3 centimeters wide?

A

2

B

6

C

8

D

16

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