In a sample of size 
and the proportion that respond favorably is 
, then the standard error is:
A. 0.0012
B. 80
C. 
D. 
Answer: C
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Decide whether the statement is true or false.A numeral in an even base is even if and only if its ones digit is even.
A. True B. False
The graph of the function f shown in the accompanying figure gives the elevation of that part of the Boston Marathon course that includes the notorious Heartbreak Hill. Determine the intervals (stretches of the course) where the function f is increasing (the runner is laboring), where it is constant (the runner is taking a breather), and where it is decreasing (the runner is coasting).
?
?
A. Decreasing on 
and 
, increasing on 
and 
, and constant on 
and 
B. Decreasing on 
and 
, increasing on 
and 
, and constant on 
and 
C. Decreasing on 
and 
, increasing on 
and 
, and constant on 
and 
Solve the following system of equations by substitution. If both variables cancel out, state the solution as no solution or infinitely many solutions.x + 9y = 12-6x + 8y = 52
A. (-7, 3) B. no solution C. (-6, 2) D. (6, 3)
Factor.2n2 + 5n - 63
A. (2n - 9)(9 - 2n) B. (2n - 72)(2n - 9) C. (2n - 9)(n + 7) D. (2n - 9)(n - 7)