Solve the inequality algebraically. Express the solution in interval notation.x4 < 81x2
A. (-?, -9) ? (9, ?)
B. (-9, 0) ? (9, ?)
C. (-9, 0) ? (0, 9)
D. (-?, -9) ? (0, 9)
Answer: C
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Find the derivative.
A. 
x5 - 
B. 7x3
C. 14x7/2
D. 
x5
Solve the problem.A plane takes off from an airport on the bearing S29°W. It continues for 20 minutes then changes to bearing 
and flies for 2 hours 20 minutes on this course then lands at a second airport. If the plane' s speed is 420 mph, how far from the first airport is the second airport? Round your answer correct to the nearest mile.
A. 1010 mi B. 1011 mi C. 1111 mi D. 1110 mi
Find the debt-to-equity ratio rounded to the nearest hundredth.Great Lakes Foundry has current liabilities of $250,000, long-term liabilities of $626,000, and owner's equity of $1,358,000.
A. 0.46 B. 0.40 C. 1.55 D. 0.65
Maximize 
subject to the given constraints.
?
?
A. 
B. 
C. 
D. no solution
E. none of these