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Kaufmann & Schwitters-College Algebra 7/e (Homework)

James Finch

Math - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 1/23

Due: Thursday, September 9, 2010 22:00 EDT

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Question
Points
1 2 3 4 5 6 7 8
1/4 0/4 0/1 0/4 0/1 0/4 0/1 0/4
Total
1/23

Description

Create your course assignments by selecting questions from our bank of 1500 end-of-section exercises, as well as enhanced interactive examples with videos.

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In this assignment we present several textbook question types found in Chapter 3 on Functions in College Algebra 7/e by Jerome E. Kaufmann and Karen L. Schwitters published by Brooks/Cole.


Instructions

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



1. 1/4 points All Submissions Notes Question: KaufColAlg7 3.1.009.
Question part
Points
Submissions
1 2 3 4
0/1 1 0/1 0/1
2/50 1/50 2/50 2/50
Total
1/4
 
Find the values of the given function.
f(x)={(4 x text( for ) x>=0,3 x**2 text( for ) x<0)
f(4) =
Enter an exact number.
Your answer is incorrect.
f(8) =
Enter an exact number.
Your answer is correct.
f(-2) =
Enter an exact number.
Your answer is incorrect.
f(-4) =
Enter an exact number.
Your answer is incorrect.

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2. –/4 points Notes Question: KaufColAlg7 3.1.091.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
The height of a projectile fired vertically into the air (neglecting air resistance) at an initial velocity of 126 feet per second is a function of the time, t, and is given by the equation h(t) = 126t - 16t2. Compute the following.
h(2) =
Enter an exact number.
 ft
h(4) =
Enter an exact number.
 ft
h(6) =
Enter an exact number.
 ft
h(7) =
Enter an exact number.
 ft

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3. –/1 points Notes Question: KaufColAlg7 3.2.008.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Graph the following linear function.
$ f(x) = -x - {\color{red}1} $

Get Flash Player
Flash Player version 10 or higher is required for this question.
You can get Flash Player free from Adobe's website.


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4. –/4 points Notes Question: KaufColAlg7 3.2.028.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
A retailer has a number of items that she wants to sell and make a profit of 40% of the cost of each item. The function s(c) = c + 0.4c = 1.4c, where c represents the cost of an item, can be used to determine the selling price.

Find the selling price of items that cost $3.40.
$
Enter an exact number.


Find the selling price of items that cost $15.00.
$
Enter an exact number.


Find the selling price of items that cost $21.30.
$
Enter an exact number.


Find the selling price of items that cost $24.10.
$
Enter an exact number.

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5. 0/1 points All Submissions Notes Question: KaufColAlg7 3.4.003.
Question part
Points
Submissions
1
0/1
1/50
Total
0/1
 
Graph the quadratic function.
$ f(x) = {\color{red}3} x^2 + {\color{red}24} x + {\color{red}51} $

Get Flash Player
Flash Player version 10 or higher is required for this question.
You can get Flash Player free from Adobe's website.


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6. –/4 points Notes Question: KaufColAlg7 3.4.025.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
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0/4
 
Find the x intercepts and the vertex of the parabola. (Enter NONE in any unused answer blanks.)
f(x)=x**2-8 x+15

(
Enter a mathematical expression.
, 0) (smaller x intercept)
(
Enter a mathematical expression.
, 0) (larger x intercept)

(
Enter a mathematical expression.
,
Enter a mathematical expression.
) (vertex)

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7. –/1 points Notes Question: KaufColAlg7 3.4.041.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Solve the problem.
Suppose that the equation p(x) = -2x2 + 300x - 1000, where x represents the number of items sold, describes the profit function for a certain business. How many items should be sold to maximize the profit?
x =
Enter an exact number.
 items

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8. 0/4 points All Submissions Notes Question: KaufColAlg7 3.6.016.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 1/50 0/50 1/50
Total
0/4
 
Consider the functions.
f(x) = 3 x**2 - x - 1, text( ) g(x) = x + 2
Find the compositions and specify the domain for each.
(fcomposeg)(x) =
    

Your answer is incorrect.



(gcomposef)(x) =
    

Your answer is incorrect.


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