Determine if the argument is valid.6 is a rational number. 
is a rational number. Therefore, 6 is 
.
A. Valid
B. Invalid
Answer: B
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The data in the figure below represents the annual salaries of 120 professional mathematicians.
Approximately how many mathematicians make $50,000 or more?
A. 40 B. 50 C. 60 D. 14 E. none of these
Find the foci of the given hyperbola.
- 
= 1
A. (0, - 
) , (0, 
)
B. (-11, 0), (11, 0)
C. (- 
, 0) , (
, 0)
D. (0, -5), (0, 5)
Find the slope of the line containing the two points.(2, -8); (0, 9)
A. 
B. - 
C. - 
D. 
Two planes take off at the same time from an airport. The first plane is flying at 246 miles per hour on a course of 130.0°. The second plane is flying in the direction 165.0° at 359 miles per hour. Assuming there are no wind currents blowing, how far apart are they after 2 hours? ? Apply the rules regarding the use of significant digits after all computations are complete. ?
A. 423 miles B. 421 miles C. 427 miles D. 431 miles E. 429 miles