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 
how many units from the center of the ellipse would the two people stand?
A. 5 units
B. 4 units
C. 16 units
D. 3 units
Answer: B
Mathematics
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Graph the system of inequalities.x + 2y ? -4x - y ? 5
A. 
B. 
C. 
D. 
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Find the slope of the line.y = -8x
A. m = 8 B. m = -8 C. m = 1 D. m = 0
Mathematics
Perform the operation indicated. Simplify.
+ 
+ 
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.An urn contains four red balls and six white balls. A sample of four balls is selected.(a) How many samples are possible?(b) How many samples contains exactly three white balls?(c) How many samples contain four white balls?
What will be an ideal response?
Mathematics