Ineed on numbers 13 and 17 ! show work for brainlest answer : ))

13.

17. Neither direct variation nor inverse variation.

Step-by-step explanation:

13. The diameter of gear (d) and the force (f) required to make it rotate at a constant rate are inversely proportional.

So, the product of the variables d and f is constant.  

Now, for d = 9 inches , f = 40 pounds and the product is 360

And for d = 12 inches , f = 30 pounds and the product is 360

Therefore, the relation between d and f is . (Answer)

17. y = -6x relation is neither direct variation nor inverse variation. (Answer)

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step-by-step explanation:

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