Acquisition of Language The percentage p(t) of children who can speak in a...

Acquisition of Language The percentage p(t) of children who can speak in at least single words by the age of t months can be approximated by the equation

a. Give a technology formula for p.

b. Graph p for 8.5 ≤ t ≤ 20 and 0 ≤ p ≤ 100.

c. Create a table of values of p for t = 9, 10, . . . , 20 (rounding answers to one decimal place).

d. What percentage of children can speak in at least single words by the age of 12 months?

e. By what age are 90% or more children speaking in at least single words?