Perform the matrix row operation and write the new matrix.
-2R1 + R2
A. 
B. 
C. 
D. 
Answer: B
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Solve the equation.ab = 0
A. a = 0 or b = 0 B. a = -1 or b = 1 C. a = 1 or b = 1 D. a = 1 or b = -1
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. 13 units B. 25 units C. 12 units D. 5 units
Solve the problem.How many different 11-letter words (real or imaginary) can be formed from the letters of the word MISSISSIPPI? Leave your answer in factorial form.
Fill in the blank(s) with the appropriate word(s).
Solve the problem.A contestant in a 29-mile race finished in 5 hours. What was her average rate during the race? Use the formula d = rt. (Round to the nearest tenth, if necessary.)
A. 145 mph B. 0.2 mph C. 24 mph D. 5.8 mph