Find the vertices and foci of the ellipse. Graph the ellipse.
+ 
= 1
A. Foci at (0, - 
) and (0, 
)
Vertices at (0, -9), (0, 9)
B. Foci at (-9, 0) and (9, 0)
Vertices at (-81, 0), (81, 0)
C. Foci at (0, -9) and (0, 9)
Vertices at (0, -81), (0, 81)
D. Foci at (- 
, 0) and (
, 0)
Vertices at (-9, 0), (9, 0)
Answer: D
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Use a graphing calculator to graph the hyperbola.2.7x2 - 5y2 = 13
A. y = ±
B. y = ±
C. y = ±
D. y = ±2.7
Solve the problem.An experienced bank auditor can check a bank's deposits twice as fast as a new auditor. Working together it takes the auditors 22 hours to do the job. How long would it take the experienced auditor working alone?
A. 22 hr B. 33 hr C. 44 hr D. 66 hr
Solve the problem.The table lists the amount of emissions of a certain pollutant in millions of tons.
If the amount of emissions is modeled by a function of the form 
where x is the year, estimate the year in which the amount of emissions will be 
tons.
A. 2075 B. 2090 C. 2050 D. 2020
Fill in the blank with one of the words or phrases listed below.
The 
of a set of an ordered set of numbers is the middle number.
A. mean B. median C. mode D. probability