Find the unit tangent vector of the given curve.r(t) = (4t cos t - 4 sin t)j + (4t sin t + 4 cos t)k
A. T = - 
(sin t)j + 
(cos t)k
B. T = (4 cos t)j - (4 sin t)k
C. T = (-4 sin t)j + (4 cos t)k
D. T = (-sin t)j + (cos t)k
Answer: D
Mathematics
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Factor completely. If unfactorable, indicate that the polynomial is prime.x3 - 36x + 2x2 - 72
A. (x2 - 36)(x + 2) B. prime C. (x - 6)2(x + 2) D. (x + 6)(x - 6)(x + 2)
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Use the Half-angle Formulas to find the exact value of the trigonometric function. sin 
A. 
B. 
C. 
D. 
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Find the quotient.(40x8 + 30x5 - 10x3) ÷ (-5x3)
A. -8x5 + 30x5 - 10x3 B. -8x5 - 6x2 + 2 C. 40x5 + 30x2 - 10 D. -8x8 - 6x5 + 2x3
Mathematics
Fill in the blank with one of the words or phrases listed below.
A symbol used to represent a number is called a 
.
A. variable B. base C. set D. solution
Mathematics