Add or subtract. Simplify the answer.
+ 
A. 
B. 
C. 
D. 
Answer: A
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Provide an appropriate response.Suppose that a data set has a mean of 100 and a standard deviation of 5. If a positive number k is added to every item of the data set, how will this affect the mean and the standard deviation?
What will be an ideal response?
Solve and give interval notation for the solution set. Then graph the solution set.x + 5 ? - 
or x + 5 ? 
A. [- 
, - 
]
B. [- 
, - 
]
C. (-?, - 
] ? [- 
, ?)
D. (-?, - 
] ? [- 
, ?)
Solve the problem.Economists use what is called a Leffer curve to predict the government revenue for tax rates from 0% to 100%. Economists agree that the end points of the curve generate 0 revenue, but disagree on the tax rate that produces the maximum revenue. Suppose an economist produces this rational function 
where R is revenue in millions at a tax rate of x percent. Use a graphing calculator to graph the function. What tax rate produces the maximum revenue? What is the maximum revenue?
A. 36.6%; $268 million B. 41.2%; $264 million C. 35.8%; $276 million D. 34.0%; $271 million
Write the augmented matrix for the system of equations. 9x + 5z = 8 6y + 3z = 42 3x + 8y + 2z = 66
A. 
B. 
C. 
D. 