F x and r are inversely proportional and x = 9 when r = 72, then what is x when r = 40?
1 answer:
Answer:
16.2
Step-by-step explanation:
r = k/x
72 = k/9
k = 72*9
When r = 40 ,
x = k/r
x = 72*9/40 = 16.2
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