Solve the problem.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 8% cement should he mix with 8 bags of 16% cement to produce a mix containing 12% cement?
A. 10 bags
B. 21 bags
C. 16 bags
D. 8 bags
Answer: D
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = (10 + t)i + (4 + ln(sec t))j - 4k, -?/2 < t < ?/2
A. T = (cos t)i + (sin t)j; N = (- sin t)i + (cos t)j B. T = (cos t)i - (sin t)j; N = (-sin t)i - (cos t)j C. T = (-cos t)i - (sin t)j; N = (-cos t)i + (sin t)j D. T = (-cos t)i - (sin t)j; N = (sin t)i - (cos t)j
Use braces to write the members of the set, or state that the set has no members.The whole numbers greater than 3 and less than 7
A. {4, 5, 6} B. {3, 4, 5, 6, 7} C. {4, 5, 6, 7} D. {3, 4, 5, 6}
Solve the problem.Find the average height of the paraboloid 
above the annular region 
in the 
.
A. 
B. 
C. 
D. 340
Find the area of the specified region.Shared by the circles r = 4 cos ? and r = 4 sin ?
A. 2(? - 2)
B. 2(2 - 
)
C. 4?
D. 
(4? - 3
)