If , find .
?

A.
B.
C.
D.
E.

Answer: E

Mathematics

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Find a formula for the nth term of the sequence.1, - , , - ,   (reciprocals of squares with alternating signs)

A. an = 
B. an = 
C. an = 
D. an = 

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Mathematics

Use a calculator to find the acute angle between the planes to the nearest thousandth of a radian.3x - 10y - 10z = -3 and- 6x + 7y - 10z = 8

A. 1.510 rad B. 1.325 rad C. 1.485 rad D. 0.061 rad

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Mathematics

Solve the problem.A merchant has coffee worth $30 a pound that she wishes to mix with 90 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?

A. 540 lb B. 225 lb C. 270 lb D. 450 lb

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Mathematics

What percent of 300 is 54?

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Mathematics