What will be an ideal response?
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
i + 
j + 4tk
A. T = 
(cos 0.75t)i - 
(sin 0.75t)j ; N = (-sin 0.75t)i - (cos 0.75t)j
B. T = 
(sin 0.75t)i - 
(cos 0.75t)j ; N = (-sin 0.75t)i - (cos 0.75t)j
C. T = 
(cos 0.75t)i - 
(sin 0.75t)j + 
k ; N = (-sin 0.75t)i - (cos 0.75t)j
D. T = 
(cos 0.75t)i - 
(sin 0.75t)j + 
k ; N = (-sin 0.75t)i - (cos 0.75t)j
Parametrize the surface S.S is the portion of the cone 
+ 
= 
that lies between z = 2 and z = 4
What will be an ideal response?
Write the whole number in expanded form.8973
A. 8,973,000 B. 800 + 70 + 9 C. 8000 + 900 + 70 + 3 D. 3000 + 700 + 90 + 8
Solve the problem.A grain dealer sold to one customer 5 bushels of wheat, 2 of corn, and 3 of rye, for $33.60; to another, 2 of wheat, 3 of corn, and 5 of rye, for $33.80; and to a third, 3 of wheat, 5 of corn, and 2 of rye, for $35.80. What was the price per bushel for corn?
A. $3.60 B. $2.70 C. $3.95 D. $2.20