Find the unit tangent vector T and the principal unit normal vector N. r(t) = (4 + t)i + (4 + ln(sec t))j - 9k, -?/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 = (sin t)i - (cos t)j
D. T = (-cos t)i - (sin t)j; N = (-cos t)i + (sin t)j
Answer: A
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Write and solve an equation to answer the question. Round your answer to the nearest tenth of a percent, if necessary.215 farms is what percent of 1800 farms?
A. 0.0% B. 0.1% C. 11.9% D. 837.2%
Determine whether the pair of lines is parallel, perpendicular, or neither.y = - 2x + 2y = 
x + 1
A. parallel B. perpendicular C. neither
Solve the system.
- 
- 
= - 
- 
+ 
+ 
-17.0px;" /> = 
- 
- 
= - 
A. 
B. 
C. {(-1, 4, 5)}
D. {(-1, 4, -5)}
Determine whether f is an arithmetic sequence. If so, identify the common difference.
A. No B. Yes; n2