Solve the problem.In a regular polygon with n sides, if the distance from the center to the midpoint of a side is R and ? is the central angle subtended by one side, then the length of a side x is given by  Solve for ?.

A. ? = cot-1 
B. ? = 2 tan-1 
C. ? = tan-1 
D. ? = 2 cot-1 

Answer: B

Mathematics

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Solve the problem.The work W (in joules) done by a force F (in newtons) moving an object through a distance x (in meters) is given by  Find a formula for W, if  and k is a constant.

A. W = k + C
B. W =  + C
C. W =  + C
D. W = kx2 + C

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Mathematics

Find the least common multiple.x2 - 5x, x2 - 7x + 10

A. x(x - 5)(x - 2) B. x(x - 3)(x - 2) C. x(x - 3)2 D. (x - 3)2

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Mathematics

Find the derivative of the function at the given value of x.f(x) = x3 + 4x; x = -2

A. 12 B. 4 C. -2 D. 16

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Mathematics

Solve the proportion. = 

A. r = 4 B. r = -4 C. r = 3 D. r = -12

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Mathematics