Solve the problem.Suppose that the data set {x1,x2, x3, ...,xN} has average A and standard deviation s. If A' and s' are the average and standard deviation of the data set 
respectively, then
A. A' = A + c and s' = s.
B. A' = A and s' = s.
C. A' = A + c and s' = s + c.
D. A' = A and s' = s + c.
E. none of these
Answer: A
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Express the number in decimal notation.8.1 × 105
A. 81,000 B. 8,100,000 C. 405 D. 810,000
Write an equation that models the described quantity. Specify what each variable represents.A worker has already earned $400 and is being paid $12 per hour.
A. t = 400p + 12, where p represents total pay in dollars and t represents time in hours B. t = 12p + 400, where p represents total pay in dollars and t represents time in hours C. p = 12t + 400, where p represents total pay in dollars and t represents time in hours D. p = 400t + 12, where p represents total pay in dollars and t represents time in hours
Find the range of the quadratic function.y + 1 = (x - 1)2
A. (-?, 1] B. [1, ?) C. [- 1, ?) D. (-?, - 1]
pH levels Use the following information. Chemists use the pH (hydrogen potential) of a solution to measure its acidity or basicity. The pH is given by the formula pH = -lg
where 
is the concentration of hydrogen ions in moles per liter. What value of is associated with pH level 11?
