Answer
34
Work Step by Step
we seek the first value of t such that p(t) is at least 75, since t=34 has this property at p(34)=77.9
we conclude that by 34 months 75% or more are speaking in sentences of five or more words.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 1 - Section 1.1 - Functions from the Numerical, Algebraic, and Graphical Viewpoints - Exercises - Page 55: 52e
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