Calculus For The Life Sciences
2nd Edition
ISBN: 9780321964038
Author: GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher: Pearson Addison Wesley,
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Chapter 4.4, Problem 68E
To determine
(a)
To find:
The function
To determine
(b)
To find:
The heat index when the temperature
To determine
(c)
To find:
The rate of change of the heat index when
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Calculus For The Life Sciences
Ch. 4.1 - YOUR TURN If ft=1t, find f't.Ch. 4.1 - Prob. 2YTCh. 4.1 - YOUR TURN If ht=-3t2+2t+5t4-7, find h't.Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...
Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Find the derivative of each function defined as...Ch. 4.1 - Prob. 17ECh. 4.1 - Prob. 18ECh. 4.1 - Prob. 19ECh. 4.1 - Prob. 20ECh. 4.1 - Prob. 21ECh. 4.1 - Prob. 22ECh. 4.1 - Which of the following describes the derivative...Ch. 4.1 - Which of the following describes the derivative...Ch. 4.1 - Explain the relationship between the slope and the...Ch. 4.1 - Prob. 26ECh. 4.1 - Find each derivative. Dx9x-1/2+2x3/2Ch. 4.1 - Find each derivative. Dx8x4-3x3Ch. 4.1 - Prob. 29ECh. 4.1 - Find each derivative. f'3 if fx=x39-7x2Ch. 4.1 - In Exercises 31-34, find the slope of the tangent...Ch. 4.1 - In Exercises 31-34, find the slope of the tangent...Ch. 4.1 - In Exercises 31-34, find the slope of the tangent...Ch. 4.1 - In Exercises 31-34, find the slope of the tangent...Ch. 4.1 - Prob. 35ECh. 4.1 - Find all points on the graph of fx=x3+9x2+19x-10...Ch. 4.1 - Prob. 37ECh. 4.1 - In Exercises 37-40, for each function find all...Ch. 4.1 - Prob. 39ECh. 4.1 - Prob. 40ECh. 4.1 - Prob. 41ECh. 4.1 - At what point on the graph of fx=-5x2+4x-2 is the...Ch. 4.1 - Prob. 43ECh. 4.1 - Prob. 44ECh. 4.1 - Prob. 45ECh. 4.1 - Prob. 46ECh. 4.1 - Prob. 47ECh. 4.1 - In Exercises 43-46 of section 1.4, the effect of a...Ch. 4.1 - Show that, for any constant k, ddxfxk=f'xk.Ch. 4.1 - Prob. 50ECh. 4.1 - Cancer Insulation workers who were exposed to...Ch. 4.1 - Prob. 52ECh. 4.1 - Insect Mating Patterns In an experiment testing...Ch. 4.1 - Prob. 54ECh. 4.1 - Bighorn Sheep The cumulative horn volume for...Ch. 4.1 - Brain Mass The brain mass of a human fetus during...Ch. 4.1 - Prob. 57ECh. 4.1 - Body Mass Index The body mass index BMI is a...Ch. 4.1 - Prob. 59ECh. 4.1 - Prob. 60ECh. 4.1 - Prob. 61ECh. 4.1 - Prob. 62ECh. 4.1 - Prob. 63ECh. 4.1 - Dogs Human Age From the data printed in the...Ch. 4.1 - Prob. 65ECh. 4.1 - Prob. 66ECh. 4.1 - Prob. 67ECh. 4.1 - Prob. 68ECh. 4.1 - Prob. 69ECh. 4.1 - Prob. 70ECh. 4.1 - Prob. 71ECh. 4.1 - Prob. 72ECh. 4.1 - Postal Rates U.S postal rates have steadily...Ch. 4.1 - Money The total amount of money in circulation for...Ch. 4.1 - Prob. 75ECh. 4.2 - YOUR TURN Find the derivative of y=x3+74-x2.Ch. 4.2 - Prob. 2YTCh. 4.2 - YOUR TURN Find Dx5x-32x+73x+7.Ch. 4.2 - Prob. 1ECh. 4.2 - Prob. 2ECh. 4.2 - Prob. 3ECh. 4.2 - Prob. 4ECh. 4.2 - Prob. 5ECh. 4.2 - Prob. 6ECh. 4.2 - Prob. 7ECh. 4.2 - Prob. 8ECh. 4.2 - Prob. 9ECh. 4.2 - Prob. 10ECh. 4.2 - Prob. 11ECh. 4.2 - Prob. 12ECh. 4.2 - Prob. 13ECh. 4.2 - Use the quotient rule to find the derivative of...Ch. 4.2 - Use the quotient rule to find the derivative of...Ch. 4.2 - Prob. 16ECh. 4.2 - Prob. 17ECh. 4.2 - Prob. 18ECh. 4.2 - Prob. 19ECh. 4.2 - Prob. 20ECh. 4.2 - Prob. 21ECh. 4.2 - Prob. 22ECh. 4.2 - Prob. 23ECh. 4.2 - Prob. 24ECh. 4.2 - Use the quotient rule to find the derivative of...Ch. 4.2 - Prob. 26ECh. 4.2 - Use the quotient rule to find the derivative of...Ch. 4.2 - Prob. 28ECh. 4.2 - Prob. 29ECh. 4.2 - Prob. 30ECh. 4.2 - Find the error in the following work....Ch. 4.2 - Prob. 32ECh. 4.2 - Find an equation of the line tangent to the graph...Ch. 4.2 - Find an equation of the line tangent to the graph...Ch. 4.2 - Prob. 35ECh. 4.2 - Prob. 36ECh. 4.2 - Prob. 37ECh. 4.2 - Prob. 38ECh. 4.2 - Prob. 39ECh. 4.2 - For each function, find the values of x in which...Ch. 4.2 - Prob. 41ECh. 4.2 - Growth Models In Exercise 52 of section 1.5, the...Ch. 4.2 - Bacteria Population Assume that the total number...Ch. 4.2 - Work/Rest Cycles Murrells formula for calculating...Ch. 4.2 - Optimal Foraging Using data collected by zoologist...Ch. 4.2 - Cell Traction Force In a matrix of cells, the cell...Ch. 4.2 - Prob. 47ECh. 4.2 - Cellular Chemistry The release of a chemical...Ch. 4.2 - Prob. 49ECh. 4.2 - Memory Retention Some psychologists content that...Ch. 4.2 - Prob. 51ECh. 4.2 - Prob. 52ECh. 4.3 - YOUR TURN For the functions in Example 1, find fg0...Ch. 4.3 - YOUR TURN Let fx=2x-3 and gx=x2+1. Find gfx.Ch. 4.3 - YOUR TURN Write hx=2x-33 as a composition of two...Ch. 4.3 - YOUR TURN Find dy/dx if y=5x2-6x-2.Ch. 4.3 - Prob. 5YTCh. 4.3 - Prob. 6YTCh. 4.3 - Prob. 7YTCh. 4.3 - Prob. 1ECh. 4.3 - Prob. 2ECh. 4.3 - Prob. 3ECh. 4.3 - Prob. 4ECh. 4.3 - Prob. 5ECh. 4.3 - Prob. 6ECh. 4.3 - Prob. 7ECh. 4.3 - Prob. 8ECh. 4.3 - Prob. 9ECh. 4.3 - Prob. 10ECh. 4.3 - In Exercises 7-14, find f[gx] and g[fx]. fx=x+2;...Ch. 4.3 - In Exercises 7-14, find f[gx] and g[fx]....Ch. 4.3 - Prob. 13ECh. 4.3 - Prob. 14ECh. 4.3 - Prob. 15ECh. 4.3 - Prob. 16ECh. 4.3 - Prob. 17ECh. 4.3 - Prob. 18ECh. 4.3 - Prob. 19ECh. 4.3 - Write each function as the composition of two...Ch. 4.3 - Prob. 21ECh. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Prob. 23ECh. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Prob. 25ECh. 4.3 - Prob. 26ECh. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Prob. 28ECh. 4.3 - Prob. 29ECh. 4.3 - Prob. 30ECh. 4.3 - Prob. 31ECh. 4.3 - Prob. 32ECh. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Prob. 35ECh. 4.3 - Prob. 36ECh. 4.3 - Prob. 37ECh. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Find the derivative of each function defined as...Ch. 4.3 - Prob. 41ECh. 4.3 - Prob. 42ECh. 4.3 - Prob. 43ECh. 4.3 - Consider the following table of values of the...Ch. 4.3 - Prob. 45ECh. 4.3 - In Exercises 45-48, find the equation of the...Ch. 4.3 - In Exercises 45-48, find the equation of the...Ch. 4.3 - In Exercises 45-48, find the equation of the...Ch. 4.3 - Prob. 49ECh. 4.3 - Prob. 50ECh. 4.3 - Katie and Sarah are working on taking the...Ch. 4.3 - Margy and Nate are working on taking the...Ch. 4.3 - Prob. 53ECh. 4.3 - Oil Pollution An oil well off the Gulf Coast is...Ch. 4.3 - African Wild Dog The African wild dog is currently...Ch. 4.3 - Thermal Inversion When there is a thermal...Ch. 4.3 - Prob. 57ECh. 4.3 - Calcium Usage To test an individuals use of...Ch. 4.3 - Drug Reaction The strength of a persons reaction...Ch. 4.3 - Extinction The probability of a population going...Ch. 4.3 - Candy The volume and surface area of a jawbreaker...Ch. 4.3 - Prob. 63ECh. 4.3 - Prob. 64ECh. 4.3 - Prob. 65ECh. 4.3 - Prob. 66ECh. 4.4 - YOUR TURN 1 Find dy/dx for a. y=43x, b. y=e7x3+5Ch. 4.4 - Prob. 2YTCh. 4.4 - Prob. 3YTCh. 4.4 - YOUR TURN 4 The quantity in grams of a radioactive...Ch. 4.4 - Prob. 1ECh. 4.4 - Prob. 2ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 4ECh. 4.4 - Prob. 5ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 10ECh. 4.4 - Prob. 11ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 13ECh. 4.4 - Prob. 14ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 16ECh. 4.4 - Prob. 17ECh. 4.4 - Prob. 18ECh. 4.4 - Prob. 19ECh. 4.4 - Prob. 20ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 25ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 28ECh. 4.4 - Prob. 29ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 31ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 33ECh. 4.4 - Find derivatives of the functions defined as...Ch. 4.4 - Prob. 35ECh. 4.4 - Prob. 36ECh. 4.4 - Use graphical differentiation to verify that...Ch. 4.4 - Prob. 38ECh. 4.4 - Population Growth In section 2.1, Exercise 37, the...Ch. 4.4 - Minority Population In Section 2.1, Exercise 39,...Ch. 4.4 - Insect Growth The growth of a population of rare...Ch. 4.4 - Prob. 43ECh. 4.4 - Whooping Cranes Based on data from the U.S. Fish...Ch. 4.4 - Prob. 45ECh. 4.4 - Prob. 46ECh. 4.4 - Mortality The percentage of people of any...Ch. 4.4 - Breast Cancer It has been observed that the...Ch. 4.4 - Arctic Foxes The age-weight relationship of female...Ch. 4.4 - Prob. 50ECh. 4.4 - Ayrshire Dairy Cattle The researchers from the...Ch. 4.4 - Cutlassfish The cutlassfish is one of the most...Ch. 4.4 - Prob. 53ECh. 4.4 - Dialysis One measure of whether a dialysis patient...Ch. 4.4 - Medical Literature It has been observed that there...Ch. 4.4 - Prob. 56ECh. 4.4 - Prob. 57ECh. 4.4 - Prob. 58ECh. 4.4 - Prob. 59ECh. 4.4 - Prob. 60ECh. 4.4 - Radioactive Iron Researchers found that the...Ch. 4.4 - Prob. 62ECh. 4.4 - Prob. 63ECh. 4.4 - Prob. 64ECh. 4.4 - Habit Strength According to work by the...Ch. 4.4 - Prob. 66ECh. 4.4 - Electricity In a series resistance-capacitance DC...Ch. 4.4 - Prob. 68ECh. 4.4 - Prob. 69ECh. 4.5 - YOUR TURN Find the derivative of fx=log3x.Ch. 4.5 - Prob. 2YTCh. 4.5 - Prob. 3YTCh. 4.5 - Find the derivative of each function. y=ln8xCh. 4.5 - Prob. 2ECh. 4.5 - Prob. 3ECh. 4.5 - Prob. 4ECh. 4.5 - Find the derivative of each function. y=ln4x2-9xCh. 4.5 - Find the derivative of each function. y=ln-8x3+2xCh. 4.5 - Find the derivative of each function. y=lnx+5Ch. 4.5 - Prob. 8ECh. 4.5 - Prob. 9ECh. 4.5 - Prob. 10ECh. 4.5 - Prob. 11ECh. 4.5 - Prob. 12ECh. 4.5 - Prob. 13ECh. 4.5 - Find the derivative of each function. y=xln2-x2Ch. 4.5 - Prob. 15ECh. 4.5 - Find the derivative of each function. v=lnuu3Ch. 4.5 - Prob. 17ECh. 4.5 - Prob. 18ECh. 4.5 - Find the derivative of each function. y=3x2lnxCh. 4.5 - Prob. 20ECh. 4.5 - Prob. 21ECh. 4.5 - Find the derivative of each function. y=lnx-3Ch. 4.5 - Find the derivative of each function. y=lnlnxCh. 4.5 - Prob. 24ECh. 4.5 - Prob. 25ECh. 4.5 - Prob. 26ECh. 4.5 - Prob. 27ECh. 4.5 - Find the derivative of each function. py=lnyeyCh. 4.5 - Prob. 29ECh. 4.5 - Prob. 30ECh. 4.5 - Prob. 31ECh. 4.5 - Find the derivative of each function. y=log4x-3Ch. 4.5 - Prob. 33ECh. 4.5 - Prob. 34ECh. 4.5 - Prob. 35ECh. 4.5 - Find the derivative of each function. y=log74x-3Ch. 4.5 - Find the derivative of each function....Ch. 4.5 - Find the derivative of each function....Ch. 4.5 - Prob. 39ECh. 4.5 - Find the derivative of each function. z=10ylogyCh. 4.5 - Prob. 41ECh. 4.5 - Find the derivative of each function. fx=lnxex+2Ch. 4.5 - Prob. 43ECh. 4.5 - Prob. 44ECh. 4.5 - Prob. 45ECh. 4.5 - Prob. 46ECh. 4.5 - Prob. 47ECh. 4.5 - Use a graphing calculator to sketch the graph of...Ch. 4.5 - Prob. 49ECh. 4.5 - Prob. 50ECh. 4.5 - Prob. 51ECh. 4.5 - Prob. 52ECh. 4.5 - Prob. 53ECh. 4.5 - Prob. 54ECh. 4.5 - Prob. 55ECh. 4.5 - This exercise shows another way to derive the...Ch. 4.5 - Prob. 57ECh. 4.5 - Population Growth Suppose that the population of a...Ch. 4.5 - Body Surface Area There is a mathematical...Ch. 4.5 - Prob. 60ECh. 4.5 - Prob. 61ECh. 4.5 - Fruit Flies A study of the relation between the...Ch. 4.5 - Prob. 63ECh. 4.5 - Poverty The passage of the Social Security...Ch. 4.5 - Richter Scale The Richter scale provides a measure...Ch. 4.5 - Prob. 66ECh. 4.6 - YOUR TURN Find the derivative of y=5sin3x4.Ch. 4.6 - YOUR TURN Find the derivative of y=2sin3x.Ch. 4.6 - Prob. 3YTCh. 4.6 - Prob. 4YTCh. 4.6 - Prob. 5YTCh. 4.6 - Prob. 6YTCh. 4.6 - Prob. 1ECh. 4.6 - Prob. 2ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 4ECh. 4.6 - Prob. 5ECh. 4.6 - Prob. 6ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 8ECh. 4.6 - Prob. 9ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 11ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 13ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 15ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 17ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 19ECh. 4.6 - Prob. 20ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 23ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 25ECh. 4.6 - Find the derivatives of the functions defined as...Ch. 4.6 - Prob. 27ECh. 4.6 - Prob. 28ECh. 4.6 - Prob. 29ECh. 4.6 - In Exercises 27-32, recall that the slope of the...Ch. 4.6 - Prob. 31ECh. 4.6 - In Exercises 27-32, recall that the slope of the...Ch. 4.6 - Find the derivative of cotx by using the quotient...Ch. 4.6 - Prob. 34ECh. 4.6 - Verify that the derivative of cscx is -cscxcotx....Ch. 4.6 - Prob. 36ECh. 4.6 - Prob. 37ECh. 4.6 - Carbon Dioxide Levels At Barrow, Alaska,...Ch. 4.6 - Prob. 39ECh. 4.6 - Sound If a string with a fundamental frequency of...Ch. 4.6 - Prob. 41ECh. 4.6 - Revenue from Seasonal Merchandise The revenue...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Prob. 10CRCh. 4.CR - Determine whether each of the following statements...Ch. 4.CR - Prob. 12CRCh. 4.CR - Prob. 13CRCh. 4.CR - Prob. 14CRCh. 4.CR - Prob. 15CRCh. 4.CR - Prob. 16CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 19CRCh. 4.CR - Prob. 20CRCh. 4.CR - Prob. 21CRCh. 4.CR - Prob. 22CRCh. 4.CR - Prob. 23CRCh. 4.CR - Prob. 24CRCh. 4.CR - Prob. 25CRCh. 4.CR - Prob. 26CRCh. 4.CR - Prob. 27CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 29CRCh. 4.CR - Prob. 30CRCh. 4.CR - Prob. 31CRCh. 4.CR - Prob. 32CRCh. 4.CR - Prob. 33CRCh. 4.CR - Prob. 34CRCh. 4.CR - Prob. 35CRCh. 4.CR - Prob. 36CRCh. 4.CR - Prob. 37CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 39CRCh. 4.CR - Prob. 40CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 42CRCh. 4.CR - Prob. 43CRCh. 4.CR - Prob. 44CRCh. 4.CR - Prob. 45CRCh. 4.CR - Prob. 46CRCh. 4.CR - Prob. 47CRCh. 4.CR - Prob. 48CRCh. 4.CR - Prob. 49CRCh. 4.CR - Prob. 50CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 52CRCh. 4.CR - Prob. 53CRCh. 4.CR - Prob. 54CRCh. 4.CR - Prob. 55CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 57CRCh. 4.CR - Prob. 58CRCh. 4.CR - Prob. 59CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 61CRCh. 4.CR - Prob. 62CRCh. 4.CR - Prob. 63CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 65CRCh. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Use the rules for derivatives to find the...Ch. 4.CR - Prob. 68CRCh. 4.CR - Consider the following table of values of the...Ch. 4.CR - Consider the following table of values of the...Ch. 4.CR - Prob. 71CRCh. 4.CR - Prob. 72CRCh. 4.CR - Find the slope of the tangent line to the given...Ch. 4.CR - Prob. 74CRCh. 4.CR - Prob. 75CRCh. 4.CR - Prob. 76CRCh. 4.CR - Prob. 77CRCh. 4.CR - Prob. 78CRCh. 4.CR - Prob. 79CRCh. 4.CR - Prob. 80CRCh. 4.CR - Prob. 81CRCh. 4.CR - Prob. 82CRCh. 4.CR - Prob. 83CRCh. 4.CR - Prob. 84CRCh. 4.CR - Prob. 85CRCh. 4.CR - Prob. 86CRCh. 4.CR - Prob. 87CRCh. 4.CR - Prob. 88CRCh. 4.CR - Prob. 89CRCh. 4.CR - Exponential Growth Suppose a population is growing...Ch. 4.CR - Logistic Growth Suppose a population can be...Ch. 4.CR - Fish The length of the monkeyface prickleback, a...Ch. 4.CR - Prob. 93CRCh. 4.CR - Prob. 94CRCh. 4.CR - Prob. 95CRCh. 4.CR - Prob. 96CRCh. 4.CR - Prob. 97CRCh. 4.CR - Prob. 98CRCh. 4.CR - Prob. 99CRCh. 4.CR - Prob. 100CRCh. 4.CR - Prob. 101CRCh. 4.EA - Suppose that a particular plot of land can sustain...Ch. 4.EA - Prob. 2EA
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- Chemists’ Wages The mean hourly wage W (in dollars) of chemists in the United States from 2000 through 2014 can be modeled by W=0.903t+26.08,0t14 where t represents the year, with t=0 corresponding to 2000. (a) According to the model, when was the mean hourly wage at least $30, but no more than $32? (b) Use the model to predict when the mean hourly wage will exceed $45.arrow_forwardPower Consumption: The figure shows the power consumption in San Francisco for a day in September (P is measured in megawatts; t is hours stating at midnight). (a) What was the power consumption at 6:00 A.M? At 6:00 P.m.? (b) When was the power consumption the lowest? (c) Find the net change in the power consumption from 9:00 A.M. to 7:00 P.M/arrow_forwardGrade Point Average In many universities students are given grade points for each credit unit according to the following scale: A 4 points B 3 points C 2 points D 1 point F 0 point For example, a grade of A in a 3-unit course earns 43=12 grade points and a grade of B in a 5-unit course earns 35=15 grade points. A students grade point average GPA for these two courses is the total number of grade points earned divided by the number of units; in this case the GPA is (12+15)8=3.375. a Find a formula for the GPA of a student who earns a grade of A in a units of course work, B in b units, C in c units, D in d units and F in f units. b Find the GPA of a student who has earned a grade of A in two 3-unit courses, B in one 4-unit courses and C in three 3-unit courses.arrow_forward
- Mortgage Rates The following table is taken from the website of Freddie Mac. It shows rates for 30-year fixed-rate mortgages since 1970. y=Year r=Mortgagerate 1975 9.05 1980 13.74 1985 12.43 1990 10.13 1995 7.93 2000 8.05 2005 5.87 2010 4.69 2015 3.84 a. Explain in practical terms the meaning of r(2003). b. Use the table to estimate the value of r(2003).arrow_forwardGrade Point Average In many universities students are given grade points for each credit unit according to the following scale: A4 points B3 points C2 points D1 points F0 points For example, a grade of A in a 3-unit earns 43=12 grade points and grade points and a grade of B in a 5-unit course earns 35=15 grade points. A student’s grade point average (GPA) for these two courses is the total number of grade points earned divided by the number of units; in this case the GPA is (12+15)/8=3.375 . (a) Find a formula for a GPA of a student who earns a grade A in a units of course work, B in b units; C in c units, D in d units, and F in f units. (b) Find a GPA of a student who has earned a grade of A in two-units courses. B in one 4-unit course, and C in three 3-unit courses.arrow_forwardStock Turnover at Retail In retail sales, an important marker of retail activity is the stock turnover at retail. This figure is calculated for a specific period of time as the total net sales divided by the retail value of the average stock during that time, where both are measured in dollars. As a formula, this is written Stockturnover=NetsalesAveragestockatretail. This formula expresses stock turnover as a function of net sales and average stock at retail. a. Suppose that your store had net sales of 682, 000 in mens shoes over the past six months and that the retail value of the average stock of mens shoes was 163, 000. What was the stock turnover at retail for that time period? b. Suppose that in a certain month, your stores net sales of womens dresses were 83, 000 and that the usual stock turnover at retail is 0.8 per month. What do you estimate to be your stores average stock at retail? c. Solve the equation for average stock at retail- that is, write a formula giving average stock at retail as a function of stock turnover and net sales. d. Suppose that in a certain time period, your store had an average stock of socks with a retail value of 45, 000 and a stock turnover at retail of 1.6. What were the stores net sales of socks during that time period? e. Solve the equation for net sales- that is, write a formula giving net sales as a function of stock turnover and average stock at retail.arrow_forward
- The Kelvin Temperature Scale Physicists and chemists often use the Kelvin temperature scale. In order to determine the relationship between the Fahrenheit and Kelvin temperature scales, a lab assistant put Fahrenheit and Kelvin thermometers side by side and took readings at various temperatures. The following data were recorded. K = kelvins F = degrees Fahrenheit 200 -99.67 220 -63.67 240 -27.67 260 8.33 280 44.33 300 80.33 a. Show that the temperature F in degrees Fahrenheit is a linear function of the temperature K in kelvins. b. What is the slope of this linear function? Note: Be sure to take into account that the table lists kelvins in jumps of 20 rather than in jumps of 1. c. Find a formula for the linear function. d. Normal body temperature is 98.6 degrees Fahrenheit. What is that temperature in kelvins? e. If temperature increases by 1 kelvin, by how many degrees Fahrenheit does it increase? If temperature increases by 1 degree Fahrenheit, by how many kelvins does it increase? f. The temperature of 0 kelvins is known as absolute zero. It is not quite accurate to say that all molecular motion ceases at absolute zero, but at that temperature the system has its minimum possible total energy. It is thought that absolute zero cannot be attained experimentally, although temperatures lower than 0.0000001 kelvin have been attained. Find the temperature of absolute zero in degrees Fahrenheit.arrow_forwardpH of Saliva The pH of saliva is normally in the range of 6.4 to 7.0. However, when a person is ill, the persons saliva becomes more acidic. a When Marco is sick, he tests the pH of his saliva and finds that it is 5.5. What is the hydrogen ion concentration of his saliva? b Will the hydrogen ion concentration in Marcos saliva increase or decrease as he gets better? c After Marco recovers, he tests the pH of his saliva, and it is 6.5. Was the saliva more acidic or less acidic when he was sick?arrow_forwardStopping distance, The stopping distance of an automobile is the distance travelled during the driver’s reaction time plus the distance travelled after the driver applies the brakes. In an experiment, researchers measured these distances (in feet) when the automobile was traveling at a speed of x. miles per hour on dry, level pavement, as shown in the bar graph. The distance travelled during the reaction time R was R=1.1x and the braking distance B was B=0.0475x20.001x+0.23. (a) Determine the polynomial that represents the total stopping distance T. (b) Use the result of part (a) to estimate the total stopping distance when x=30,x=40, andx=55 miles per hour. (c) Use the bar graph to make a statement about the total stopping distance required forincreasing speeds.arrow_forward
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