Suppose the outer edge of a playground slide is in the shape of a helix of radius 3.5 meters. The slide has a height of 2 meters and makes one complete revolution from top to bottom. Find a vector-valued function for the helix.
?

A. ,
B. ?,
C. ?,
D. ?,
E. ?,

Answer: B

Mathematics

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Find the standard deviation s for the given data. Round your answer to one more decimal place than the original data.The manager of an electrical supply store measured the diameters of the rolls of wire in the inventory. The diameters of the rolls (in m) are listed below. Compute the standard deviation(s).0.438?0.171?0.442?0.135?0.467?0.477?0.624

A. 1.2697 B. 0.1762 C. 1.0835 D. 0.135

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Mathematics

Solve the problem.If f(x) = int(4x), find f(-1.4).

A. -2 B. -1 C. -5 D. -6

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Solve the problem.An electrical circuit contains two resistors connected in parallel. If the resistance of each is R1 and R2 ohms, respectively, then their combined resistance R is given the formula R = If their combined resistance R is 2 ohms and R2 is 9 ohms, find R1.

A.  ohm
B. 7 ohms
C.  ohms
D.  ohms

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Mathematics

Simplify the expression. Assume that all variables are positive when they appear.

A. 7x7y8 
B. 7x3y4 
C. 7x3y4 
D. 7y4 

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Mathematics