Find T, N, and B for the given space curve.r(t) = (7 + t)i + (9 + ln(sec t))j - 7k, -?/2 < t < ?/2
A. T = (-cos t)i - (sin t)j; N = (sin t)i - (cos t)j ; B = -k
B. T = (cos t)i - (sin t)j; N = (-sin t)i - (cos t)j ; B = -k
C. T = (-cos t)i - (sin t)j; N = (-cos t)i + (sin t)j ; B = k
D. T = (cos t)i + (sin t)j; N = (- sin t)i + (cos t)j ; B = k
Answer: D
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Solve.Modern plumbing and Heating announced a profit of $48,127 in 2000. In 2001, their profit was $52,289. Find the increase.
Fill in the blank(s) with the appropriate word(s).
Give the center and radius of the circle. Then sketch its graph.(x + 5)2 + (y + 1)2 = 16
A. center (- 5, - 1), r = 4
B. center (5, - 1), r = 4
C. center (5, 1), r = 4
D. center (- 5, 1), r = 4
Find a decimal approximation for the fraction or mixed number, rounded to the given place value. 
; thousandths
A. 0.264 B. 0.667 C. 0.267 D. 0.268
Form a valid conclusion, using all the statements for each argument. Give reasons. ? If you learn mathematics, then you are intelligent. If you are intelligent, then you understand politics. ?
A. If you learn mathematics, then you understand politics. (transitive) B. If you learn mathematics, then you understand politics. (indirect) C. If you don't learn mathematics, then you don't understand politics. (direct) D. If you don't learn mathematics, then you don't understand politics. (indirect) E. none of these