Match the polar equation with its graph.r = 
A. 
B. 
C. 
D. 
Answer: D
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = (ln(cos t) + 3)i + 6j + (4 + t )k, -?/2 < t < ?/2
A. T = (sin t)i - (cos t)k; N = (cos t)i - (sin t)k; B. T = (-sin t)i + (cos t)k; N = (-cos t)i + (sin t)k C. T = (sin t)i + (cos t)k; N = (cos t)i - (sin t)k D. T = (-sin t)i + (cos t)k; N = (-cos t)i - (sin t)k
Perform the indicated operation.
? 
÷ 
A. 
B. 
C. 
D. 1
Answer the question.Joan chose one of the numbers 1, 2, 3, . . . , 256 and challenged John to determine the number by asking questions to which Joan would answer 'yes' or 'no'. What is the minimum number of questions that John must ask to be certain of guessing the correct number?
A. 128 questions B. 8 questions C. 16 questions D. 64 questions
I1 = 30 mA, I3 = 65 mA, I4 = 127 mA, and I5 = 515 mA. What is I2?
a. 293 mA
b. 547 mA
c. 565 mA
d. 577 mA
e. 607 mA