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ADTOCL90IN
Answered

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

Sagot :

ABDO47IN

Answer:

r=kd

12=k(3)

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

12/3=k

4=r

r=4

-9=kr

-9=(4)r

(1/4) -9=4r(1/4)

-9/4=r

-2.25=r

r=-2.25

final answer

r= -2.25

KUREIXIN

Answer:

-4

Step-by-step explanation:

r=k/d

first find the value of k the constant variation

r=k/d

r=12    and  d=3

12=k/3

k=36

find r when d = -9

r=k/d

r=36/-9

r=-4

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