Find the mass of the wire that lies along the curve r and has density ?.r(t) = (2 cos t)i + (2 sin t)j + 2tk, 0 ? t ? 2?; ? = 5
A. 20?
units
B. 40?
units
C. 4?
units
D. 10? units
Answer: A
Mathematics
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D. - 
E. - 
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a. 
b. 
c. 
d. 
e. none of the above
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Find the exact value of y, or state that y is undefined.y = csc-1 
A. 
B. 
C. - 
D. - 
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Choose the most reasonable measurement for the situation described.Tonya measured the length of her bookshelf. Choose the most reasonable measurement.
A. 97.1 mm B. 97.1 km C. 97.1 cm D. 97.1 m
Mathematics