Reference no: EM131026328
Section 8.1
+Solve each of the following systems by graphing each of the following.
10. 2x - y = 4
2x - y = 6
12. x-2y = 8
3x - 2y = 12
20. 3x - 6y = 9
X - 2y = 3
26. Find values for m and b in the following system so that the solution to the system is ( -3 , 4 )
5x + 7y = b
Mx + y = 22
Section 8.2
Solve each of the following systems by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.
12. 2x + 3y=1
5x + 3y = 16
20. x + 5y = 10
-2x - 10y = -20
56. Solve each of the following problems. Be sure to show the equations used for the solution.
Number problems. Jill has $3.50 in nickels and dimes. If she has 50 coins, how
many of each type of coin does she have?
60. Business and finance. A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be
used in the mixture?
Section 8.3
Solve each of the following systems by substitution
16. 5x - 2y = -5
Y - 5x = 3
20. 8x - 4y = 16
Y= 2x - 4
28. 4x - 12y = 5
-x + 3y = -1
Solve each of the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
38. 10x + 2y = 7
Y= -5x + 3
Solve each of the following problems. Be sure to show the equation used for the solution.
56. Business and finance. A washer-dryer combination costs $1200. If the washer costs $220 more than the dryer, what does each appliance cost separately?
58. Geometry. The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle.
Section 8.4
Solve each of the following systems of linear inequalities graphically.
10.
20. A small firm produces both AM and AM/FM car radios. The AM radios take 15 h to produce, and the AM/FM radios take 20 h. The number of production hours is Limited to 300 h per week. The plant's capacity is limited to a total of 18 radios per
week, and existing orders require that at least 4 AM radios and at least 3 AM/FM radios be produced per week. Write a system of inequalities representing this situation. Then, draw a graph of the feasible region given these conditions, in which x
is the number of AM radios and y the number of AM/FM radios.
Attachment:- math.zip
|
Estimate the population mean
: Past experience shows that the standard deviation of the yearly income of textile workers in a certain state is $400. How many textile workers would you need to sample if you wished to estimate the population mean to within $50.00, with probabilit..
|
|
Find the real solutions to the system of equations
: Solve to the homogenous system of linear equations.
|
|
Estimate the proportion of unemployed workers
: To estimate the proportion of unemployed workers in Panama, an economist selected at random 400 persons from the working class. Of these, 25 were unemployed.
|
|
Use the internet to research the current provisions
: Discuss recommendations you would make to chief financial officers (CFOs) of retailers, service providers, and other businesses that lease several locations or have substantial leases of real estate or other assets. Indicate the pros and cons of each..
|
|
What does each appliance cost separately
: Find values for m and b in the following system so that the solution to the system is ( -3 , 4 )
|
|
Confidence coefficient associate with interval
: A random sample of size 25 was taken from a normal population with σ2 = 6. A confidence interval for the mean was given as (5.37, 7.37). What is the confidence coefficient associate with this interval?
|
|
Explain how economists believe that wages are determined
: Your liberal-activist roommate is plotting to bring down capitalist society. He/she claims that workers are being cheated out of compensation that is rightly theirs. Explain how economists believe that wages are determined
|
|
Shareholder view of corporate social responsibility
: Samarco (2015) mine disaster in Brazil.1. Summarise the case and identify the major issues facing BHP.2. Assuming the Shareholder view of Corporate Social Responsibility, what SHOULD BHP do inthe wake of this disaster?
|
|
Actual proportion of cell phone
: A survey was conducted to determine what adults prefer in cell phone services. The results of the survey showed that 73% of cell phone users wanted e-mail services, with a margin of error of }4%. What is meant by the phrase "}4%"?
|