Find the domain of the rational expression. 
A. {x|x is a real number and x ? 9 and x ? 5}
B. {x|x is a real number and x ? 9 and x ? -5 and x ? 5}
C. {x|x is a real number and x ? -9 and x ? -5}
D. {x|x is a real number and x ? -9 and x ? -5 and x ? 5}
Answer: D
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Solve.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. 15 units B. 9 units C. 12 units D. 144 units
Solve the equation or inequality.7x + 5 > 6x + 8 or 1 - x > -8
A. (-?, ?) B. ? C. (3, 9) D. (-?,3) ? (9, ?)
Graph the parabola.x = (y - 4)2
A. 
B. 
C. 
D. 
Solve.
= x
A. -3, 12
B. 12
C. - 
D. empty set