Rationalize the numerator of the following expression and then simplify your answer.
?
?
A. 
B. 6
C. 216
D. 
E. 
Answer: A
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Solve the problem.Mari drops a ball from a height of 21 meters and notices that on each bounce the ball returns to about 
of its previous height. About how far will ball travel before it comes to rest?
A. 52.5 m B. 126 m C. 105 m D. 63 m
Solve the inequality.
+ 4 > 2
A. b < 2, b > 6 B. b < -6, b > -2 C. -6 < b < -10 D. b < -6, b > -10
Solve the problem and write the answer using scientific notation.Assume that the volume of the earth is 5 × 1014 cubic meters and the volume of a bacterium is 
cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 5.0 × 10-31 bacteria B. 2.0 × 10-30 bacteria C. 2.0 × 1030 bacteria D. 5.0 × 1031 bacteria
Use the fundamental identities and simplify the expression to get a numerical value.cot x sec x sin x
A. 0 B. -1 C. 1 D. sec2?