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The median weight of a boy whose age is between 0 and 36 months can be approximated by the function

The median weight of a boy whose age is between 0 and 36 months can be approximated-example-1
The median weight of a boy whose age is between 0 and 36 months can be approximated-example-1
The median weight of a boy whose age is between 0 and 36 months can be approximated-example-2

1 Answer

5 votes
a)
8.97+1.24t-0.0004t^2+0.000166t^3
Plug in 7 for t to get
8.97+1.24t-0.0004(7)^2+0.000166(7)^3
b)Take the derivative to get
1.24-0.0004*2t^+0.000166*3t^2
1.24-0.0004*2(7)^+0.000166*3(7)^2
Again sorry I don't have a calculator...
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