Find the principal unit normal vector N for the curve r(t).r(t) = (3 + t)i + (7 + ln(cos t))k, -?/2 < t < ?/2
A. N = (-sin t)i - (cos t)k
B. N = (-cos t)i - (ln(cos t))k
C. N = (-cos t)i - (tan t)k
D. N = (cos t)i + (sin t)k
Answer: A
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Using Kruskal's algorithm, which edge should we choose third?
A. AB B. AE C. GH D. BG E. none of these
I have a habit of getting up before the sun rises. My socks are all mixed up in the drawer, which contains 20 blue and 18 black socks. I reach into the drawer and grab some socks in the dark. How many socks minimum do I need to take from the drawer to be sure that I have a matched pair? ?
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Determine which point is a solution for the system of inequalities.  figure 1.png)
(a) (2,00 (b) (0,0) (c) (3,0) (d) (0,40 (e) (-1,-1)
Divide and/or multiply as indicated. Simplify and leave the numerator and denominator in your answer in factored form.
? 
÷ 
A. 
B. 
C. 
D. 