The annual expenditure for cell phones and cellular service varies in part by the age of an individual. The average annual expenditure E(a) (in S) for individuals of age a (in yr) is given in the table. 20 30 40 E(a) 50 60 70 a 502 658 649 627 476 213 a. Use regression to find a quadratic function to model the data. b. At what age is the yearly expenditure for cell phones and cellular service the greatest? Round to the nearest year. c. What is the maximum vearlv expenditure? Round to the nearest dollar.

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter3: Polynomial Functions
Section: Chapter Questions
Problem 18T
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The annual expenditure for cell phones and cellular service varies in part by the age of an individual. The average annual
expenditure E(a) (in S) for individuals of age a (in yr) is given in the table.
20 30 40
E(a)
50 60
70
a
502 658 649
627 476 213
a. Use regression to find a quadratic function to model the data.
b. At what age is the yearly expenditure for cell phones and cellular service the greatest? Round to the nearest year.
c. What is the maximum vearlv expenditure? Round to the nearest dollar.
Transcribed Image Text:The annual expenditure for cell phones and cellular service varies in part by the age of an individual. The average annual expenditure E(a) (in S) for individuals of age a (in yr) is given in the table. 20 30 40 E(a) 50 60 70 a 502 658 649 627 476 213 a. Use regression to find a quadratic function to model the data. b. At what age is the yearly expenditure for cell phones and cellular service the greatest? Round to the nearest year. c. What is the maximum vearlv expenditure? Round to the nearest dollar.
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