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Blitzer - College Algebra 4/e (Homework)

James Finch

Math - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score : 0 / 16

Due : Thursday, August 26, 2010 22:00 EDT

About this Assignment

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Question
Points
1 2 3 4 5
0/2 0/2 0/7 0/3 0/2
Total
0/16

Description

Here are some textbook questions from College Algebra 7/e by Robert Blitzer published by Prentice Hall. Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/2 points Notes Question: Blitzer4 P.2.122.
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Use the table and the fact that there are approximately 3.2 107 seconds in a year to determine how many Big Macs are eaten per second in the United States. Express the answer in scientific notation.
Enter a number.
 10
Enter a number.
 Big Macs


2. –/2 points Notes Question: Blitzer4 1.5.006.
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Solve the equation by factoring.
10x2 + 47x + 9
x =
Enter a number.
 (smaller value)
x =
Enter a number.
 (larger value)

3. –/7 points Notes Question: Blitzer4 2.5.128.
Question part
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0/1 0/1 0/1 0/1 0/1 0/1 0/1
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The function f(x) = 3.1√x + 19 models the median height, f(x), in inches, of girls who are x months of age. The graph of f is shown.
(a) The graph can be obtained by vertically stretching the graph of √x by the factor
Enter a number.
, and then shifting the result
Enter a number.
 units.

(b) According to the model, what is the median height of girls who are 37 months old? Use a calculator and round to the nearest tenth of an inch.
Enter a number.
 inches

(c) Use the model to find the average rate of change, in inches per month, between birth and 13 months. Round to the nearest tenth.
Enter a number.
 inches per month

(d) Use the model to find the average rate of change, in inches per month, between 48 and 60 months. Round to the nearest tenth.
Enter a number.

How does this compare with your answer in part (c)? This is the answer in part (c).

4. –/3 points Notes Question: Blitzer4 3.2.074.
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The bar graph shows the cumulative number of deaths from AIDS in the United States from 1990 through 2002.
The data in the bar graph can be modeled by the following second and third degree polynomial functions, where x is the number of years after 1990.
f(x) = -2,152x2 + 57,573x + 107,893
g(x) = -79x3 - 705x2 + 50,610x + 113,438
Use both functions to find the cumulative number of AIDS deaths in 2002. Which function provides a better description for the actual number shown in the bar graph?
f(12) =
Enter a number.

g(12) =
Enter a number.

    



5. –/2 points Notes Question: Blitzer4 4.3.104.
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The formula below describes the time, t, in weeks, that it takes to achieve mastery of a portion of a task, where A is the maximum learning possible, N is the portion of the learning that is to be achieved, and c is a constant used to measure an individual's learning style.
t = 1/c [ln A - ln(A-N)]
(a) Express the formula as a single logarithm.
t =
Enter a mathematical expression.
Click here to preview your answer.

(b) The formula is also used to determine how long it will take chimpanzees and apes to master a task. For example, a typical chimpanzee learning sign language can master a maximum of 55 signs. Use the form of the formula from part (a) to answer this question: How many weeks will it take a chimpanzee to master 30 signs if c for that chimp is 0.02?
Enter a number.
 weeks

Click here for help with symbolic formatting.
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