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

Here, the given function of monthly sales of a product in $1000 is of a is: S(a)=-0.4a2+21a+8...(1)…

Answered: Monthly sales, S, of a product (in…

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)

6th Edition

ISBN:9781337111348

Author:Bruce Crauder, Benny Evans, Alan Noell

Publisher:Bruce Crauder, Benny Evans, Alan Noell

Chapter3: Straight Lines And Linear Functions

Section3.CR: Chapter Review Exercises

Problem 8CR: Working on a Commission A certain man works in sales and earns a base salary of 1000 per month plus...

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TEST YOUR UNDERSTADING FOR EXAMPLE 3.3 The State of New York also has an income tax. The tax table for New York shows that a single New York resident with a taxable income of 15,000 owes 671 in New York income tax. If the taxable income is 15,500, then the table shows a tax liability of 701. Assume that the state tax is a linear function of taxable income, and find the tax owed if the taxable income is 15,350. EXAMPLE 3.3 OKLAHOMA INCOME TAX The amount of income tax T=T(l), in dollars, owed to the state of Oklahoma is a linear function of the taxable income l, in dollars, at least over a suitably restricted range of incomes. According to the Oklahoma Income Tax table for the year 2015, a single Oklahoma resident taxpayer with a taxable income of 15,000 owes 579 in Oklahoma income tax. In functional notation, this is T(15,000)=579. If the taxable income is 15,500, then the table shows a tax liability of 605. Part 1 Calculate the rate of change in T with respect to I, and explain in practical terms what it means. Part 2 How much does the taxpayer owe if the taxable income is 15,350?
Working on a Commission A certain man works in sales and earns a base salary of 1000 per month plus 5 of his total sales for the month. a. Explain why his total monthly income I is a linear function of total sales S, both measured in dollars. b. How much does he earn if he sells 1600 in merchandise in a month? c. Write a formula that gives total monthly income as a linear function of sales in a month. d. What should his monthly total sales be if he wishes to earn 1350 this month?
TEST YOUR UNDERSTADING FOR EXAMPLE 3.5 A donation to the university is required for the privilege of purchasing premium season football passes. The cost is a linear function of the number of season passes. It costs 8000 to get season passes for myself and my spouse. To get passes for my entire family of 5, it costs 17,000. Use a formula to express the total cost C, in dollars, of n season passes. EXAMPLE 3.5 CHANGING CELSIUS TO FAHRENHEIT Temperature F=F(C) in Fahrenheit is a linear function of the temperature C in Celsius. A lab assistant placed a Fahrenheit thermometer beside a Celsius thermometer and observed the following: When the Celsius thermometer reads 30 degree (C=30), the Fahrenheit thermometer reads 86 degrees (F=86). When the Celsius thermometer reads 40 degrees, the Fahrenheit thermometer reads 104 degrees. Part 1 Use a formula to express F as a linear function of C. Part 2 At sea level, water boils at 212 degrees Fahrenheit. What temperature in degrees Celsius makes water boil? Part 3 Explain in practical terms what the slope means in this setting.

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