Evaluate without the use of a calculator.sec-1 (-1)
A. ?
B. 0
C. 2?
D. 
Answer: A
Mathematics
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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
Mathematics
Evaluate the expression.(-4)-1
A. -4
B. - 
C. 
D. 4
Mathematics
Solve the problem.A nail 2
inches long is driven into a board 
thick. How much of the nail protrudes from the other side of the board?
A. 2
in.
B. 
in.
C. 1
in.
D. 
in.
Mathematics
Select the smaller of the two given numbers.- 
, - 
A. - 
B. - 
Mathematics