Calculate the arc length of the indicated portion of the curve r(t).r(t) = (5t sin t + 5 cos t)i + (5 t cos t - 5 sin t)j ; -1 ? t ? 4
A. 75
B. 37.5
C. 42.5
D. 85
Answer: B
Mathematics
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A. - 
B. - 4
C. 4
D. 
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A. y = sin (x8 + C) B. y = x8 + C C. y = sin-1 (x8 + C) D. y = cos-1 (x8 + C)
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A. 80
B. 4 + 
C. 4
D. 
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