When you are 18 years old you have a hair that is 15 centimeters long, and your hair grows about 12 centimeters each year. Let H(t) be the length, in centimeters, of that hair t years after age 18. (a) Find a formula that gives H as a linear function of t. H=   (b) How long will it take for the hair to reach a length of 100 centimeters? (Round your answer to two decimal places.)

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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When you are 18 years old you have a hair that is 15 centimeters long, and your hair grows about 12 centimeters each year. Let H(t) be the length, in centimeters, of that hair t years after age 18.

(a) Find a formula that gives H as a linear function of t.
H=
 
(b) How long will it take for the hair to reach a length of 100 centimeters? (Round your answer to two decimal places.)
 
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