Solve the problem.A twin-engined aircraft can fly 768 miles from city A to city B in 4 hours with the wind and make the return trip in 6 hours against the wind. What is the speed of the wind?
A. 16 mph
B. 64 mph
C. 48 mph
D. 32 mph
Answer: D
Mathematics
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Find the length of the curve.The curve r = a cos2 
, 0 ? ? ? ?, a > 0
A. 2?a
B. 
C. 2a
D. 
Mathematics
Solve the problem.The velocity of a fluid flowing out of a tank through a small opening d ft below the surface is given by the expression 
. Simplify the expression.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Find the length of the unknown side of the right triangle, where a and b are the legs and c is the hypotenuse. a = 6, b = 8, c = ?
A. c = 10 B. c = 7 C. c = 9 D. c = 5
Mathematics
Solve the problem.A particular freight elevator can safely carry 805 pounds. How many 
bundles of wood can be safely carried by this elevator?
A. 5 bundles B. 2 bundles C. 3 bundles D. 7 bundles
Mathematics