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94 CHAPTER R Functions, 16. Hearing-impaired Americans. The following graph shows the number of hearing-impaired Americans who are x years old. (Source: Better Hearing Institute.)

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94 CHAPTER R Functions, 16. Hearing-impaired Americans. The following graph shows the number of hearing-impaired Americans who are x years old. (Source: Better Hearing Institute.) [R. 1, R.5] N( X) A 6 5 N 4 ....... Number of hearing-impaired Americans (in millions) W ....... ....... .......! ...... N ....... ..... ..:... :....... . . .....;.. . . ..... ...... 20 40 60 80 / 100 X Age (in years) 92.3 a) What is the number of hearing-impaired Americans aged 40? b) For what age(s) are about 3,000,000 Americans hearing-impaired? c) What is a reasonable estimate of the domain of this function? Why

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