Rationalize the numerator of the following expression and then simplify your answer.
?
?
A. 
B. 6
C. 216
D. 
E. 
Answer: A
Mathematics
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Solve the problem.To get a B in biology, Katie must average 81 on five lab reports. Scores on the first four lab reports were 92, 76, 78, and 80. What is the lowest score that Katie can get on the last lab report and still receive a B?
A. 82 B. 79 C. 81 D. 74
Mathematics
Solve the system.y = x2 - 6x + 9x + y = 15
A. {(6, 21), (-1, 16)} B. {(-6, 21), (-1, 14)} C. {(6, 9), (-1, 16)} D. {(3, 12)}
Mathematics
Find the difference.- 
- 
A. - 
B. - 
C. - 
D. 
Mathematics
Solve the problem.Find the height of a pine tree that casts a 48-foot shadow on the ground assuming that the angle of elevation from the point on the ground at the tip of the shadow to the sun is 63°. Round your answer to the nearest foot.
A. 94 ft B. 43 ft C. 24 ft D. 22 ft
Mathematics