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Monthly sales, S, of a product (in $1000) is a function of the monthly advertising (in $1000), a, spent and is modeled by S(a) = - 0.4a? + 21a + 8 Where 0 < a < 13 Monthly advertising is changing in time. Monthly advertising dollars are currently decreasing at $750/month and currently monthly advertising is $10,000 How fast is monthly sales changing? (include negative sign if decreasing, nearest $10/month) $/month

Monthly sales, S, of a product (in $1000) is a function of the monthly advertising (in $1000), a, spent and is modeled by S(a) = - 0.4a? + 21a + 8 Where 0 < a < 13 Monthly advertising is changing in time. Monthly advertising dollars are currently decreasing at $750/month and currently monthly advertising is $10,000 How fast is monthly sales changing? (include negative sign if decreasing, nearest $10/month) $/month

Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Monthly sales, S, of a product (in $1000) is a function of the monthly advertising (in $1000), a, spent and is modeled by S(a) = - 0.4a? + 21a + 8 Where 0 < a < 13 Monthly advertising is changing in time. Monthly advertising dollars are currently decreasing at $750/month and currently monthly advertising is $10,000 How fast is monthly sales changing? (include negative sign if decreasing, nearest $10/month) $/month
Transcribed Image Text:Monthly sales, S, of a product (in $1000) is a function of the monthly advertising (in $1000), a, spent and is modeled by S(a) = - 0.4a? + 21a + 8 Where 0 < a < 13 Monthly advertising is changing in time. Monthly advertising dollars are currently decreasing at $750/month and currently monthly advertising is $10,000 How fast is monthly sales changing? (include negative sign if decreasing, nearest $10/month) $/month
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