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r varies inversely as d and r = 12 when d = 3. Find r when d = -9

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r=kd

12=k(3)

(1/3) 12=k3(1/3)

12/3=k

4=k

k=4

-9=kr

-9=4r

-9/4=r

-2.25=r

R= -2.25

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