Concept explainers
The graphing calculator screen displays the percentage of an adult size brain, y for a child at age x, where
Use this information to solve Exercises 35-36.
a. Explain why a logarithmic function was used to model the data.
b. Use the graphing calculator screen to express the model in function notation, with numbers rounded to the nearest whole number.
c. According to the model in part (b), what percentage of an adult size brain does a child have at age 10? Use a calculator with an
key and round to the nearest whole percent. Does this overestimate or underestimate the percent displayed by the table? By how much?
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CUSTOM BLITZER THINKING MATHEMATICALLY
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