Solve the problem.A whispering gallery is a room in the shape of an elliptic reflector. If a source of sound is placed at one focal point of an elliptic reflector, the sound is reflected through the other focal point. If one person speaks at one focal point, then another person at the other can hear sounds as faint as a whisper. If the whispering gallery is based on the ellipse 
+ 
= 1, how many units from the center of the ellipse would the two people stand?
A. 16 units
B. 3 units
C. 4 units
D. 5 units
Answer: C
Mathematics
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Which of the following is equivalent to the expression:? 
A.
?
x
B.
?
x
C.
?
x2
D.
?
x
E.
?
x
Mathematics
Solve.During one year, the Schmidt's real estate bill included $275 for miscellaneous services. Of this amount, 44% went to the library fund. How much money did the library receive?
A. $101.00 B. $84.00 C. $93.50 D. $121.00
Mathematics
Solve the inequality. Graph the solution set, and state the solution set in interval notation.|x| ? 3
A. (-?, -3] ? [3, ?)
B. (-3, 3)
C. [-3, 3]
D. (-?, 3]
Mathematics
Solve the system of equations by substitution, if a solution exists.
A. x = 0, y = -2 B. x = 1, y = -3 C. x = -3, y = 1 D. No solution
Mathematics