Find the mass of the wire that lies along the curve r and has density ?.r(t) = 5i + (9 - 3t)j + 4tk, 0 ? t ? 2? ; ? = 9(1 + sin 9t)
A. 90? units
B. 10 + 90? units
C. 18? units
D. 20 + 90? units
Answer: A
Mathematics
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