Find the mass of the wire that lies along the curve r and has density ?.r(t) = 3i + (4 - 4t)j + 3tk, 0 ? t ? 2? ; ? = 8(1 + sin 2t)

A. 80 + 80? units
B. 16? units
C. 40 + 80? units
D. 80? units


Answer: D

Mathematics

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A.
B.
C.
D.

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Find A - B.



a.
b.
c.
d.
e.

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Factor the polynomial completely.-45y2 + 32x2 + 4xy

A. (4x + 5y)(8x - 9y) B. (8x - 5y)(4x + 9y) C. (4x - 5y)(8x + 9y) D. (4x - 9y)(8x - 5y)

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Use the summation properties to evaluate the series. The following rules may be needed:      

A. - 65 B. - 85 C. - 45 D. - 33

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