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Blitzer - Precalculus Essentials 2/e (Homework)

James Finch

Math - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 5/25

Due: Thursday, August 26, 2010 23:00 EDT

About this Assignment

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Question
Points
1 2 3 4 5 6 7 8
2/3 3 0/3 0/2 0/3 0/3 0/6 0/2
Total
5/25

Description

Here are some textbook questions from Precalculus Essentials 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. 2/3 points All Submissions Notes Question: BlitzerPE2 1.2.030.
Question part
Points
Submissions
1 2 3
1 0/1 1
1/50 1/50 1/50
Total
2/3
 
Evaluate the following function at the given values of the independent variable and simplify.
g(x) = x2 - 10x - 4
(a) g(-2) =
Enter a number.
Your answer is correct.
(b) g(x + 3) =
Enter a mathematical expression.
Click here to preview your answer.Your answer is incorrect.
(c) g(-x) =
Enter a mathematical expression.
Click here to preview your answer.Your answer is correct.

Click here for help with symbolic formatting.

2. 3/3 points All Submissions Notes Question: BlitzerPE2 1.3.037.
Question part
Points
Submissions
1 2 3
1 1 1
1/50 1/50 1/50
Total
3/3
 
Use the graph to answer the following questions. (Select all that apply.)
(a) On what intervals is the function increasing?

Your answer is correct.



(b) On what intervals is the function decreasing?

Your answer is correct.



(c) On what intervals is the function constant?

Your answer is correct.




3. –/3 points Notes Question: BlitzerPE2 2.2.065.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
You have 600 feet of fencing to enclose a rectangular plot that borders on a river.
If you do not fence the side along the river, find the length and width of the plot that will maximize the area. (Let the length be the side opposite the river.)
length =
Enter an exact number.
width =
Enter an exact number.

What is the largest area that can be enclosed?
Enter an exact number.


4. –/2 points Notes Question: BlitzerPE2 3.3.095.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
Determine whether the following equation is true or false.
ln(9 x)+ln(1)=ln(9 x)
    



Show work to support your conclusion. If the statement is false, make the necessary change(s) to produce a true statement.


5. –/3 points Notes Question: BlitzerPE2 3.5.031.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
Use Newton's Law of Cooling, T = C + (T0-C)ekt, to solve the following problem.

A bottle of juice initially has a temperature of 77°F. It is left to cool in a refrigerator that has a temperature of 47°F. After 10 minutes, the temperature of the juice is 58°F.
(a) Use Newtons Law of Cooling to find a model for the temperature of the juice, T, after t minutes.
T =
Enter a mathematical expression.
Click here to preview your answer.
Click here for help with symbolic formatting.

(b) What is the temperature of the juice after 15 minutes?
Enter a number.
°F

(c) When will the temperature of the juice be 55°F?
t =
Enter a number.
 minutes

6. –/3 points Notes Question: BlitzerPE2 4.5.025.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
In the following exercise, determine the amplitude, period, and phase shift of the function.
y = -2sin(10x + /6)
amplitude
Enter a number.
period
Enter a mathematical expression.
phase shift
Enter a mathematical expression.

Graph one period of the function. (Do this on paper. Your instructor may ask you to turn in this work.)

7. –/6 points Notes Question: BlitzerPE2 6.1.017.
Question part
Points
Submissions
1 2 3 4 5 6
0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50
Total
0/6
 
In the following exercise, two sides and an angle (SSA) of a triangle are given. Determine whether the given measurements produce one triangle, two triangles, or no triangle at all. Solve each triangle that results. Round to the nearest tenth and the nearest degree for sides and angles, respectively.
a = 17, b = 13, A = 48°
(Below, enter your answers so that B1 is smaller than B2. If there is only one triangle, or none at all, enter NONE in all the excess answer blanks.)
B1 =
Enter a number.
°
C1 =
Enter a number.
°
c1 =
Enter a number.
B2 =
Answer is not case sensitive.
°
C2 =
Answer is not case sensitive.
°
c2 =
Answer is not case sensitive.


8. –/2 points Notes Question: BlitzerPE2 6.7.025.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
In the following exercise, use the dot product to determine whether v and w are orthogonal.
v = 8i + 32j,   w = 4i - j
v w =
Enter an exact number.

    


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