Find the arc length of the given curve.x =2 cos t, y = 2 sin t, z = 9t, -? ? t ? ?
A. ?
B. 
C. 2?
D. 170?
Answer: C
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Answer the question.Which of the following quantities of interest would be most difficult to determine?
A. The percentage of second graders who read above grade level B. The number of children living below the poverty line C. The number of children not counted in the last census D. The percentage of children who brush their teeth at least twice a day
Test the vector field F to determine if it is conservative.F = 
i + 
j + 
k
A. Not conservative B. Conservative
Fill in each blank with one of the words or phrases listed below. Some choices may be used more than once and some may not be used at all.
If x2 = a, then x = 
or x = -
. This property is called the 
property.
A. vertex B. square root C. quadratic D. completing the square
Solve the problem.The logistic growth model 
represents the population of a bacterium in a culture tube after t hours. When will the amount of bacteria be 610?
A. 10.34 hours B. 4.66 hours C. 7.62 hours D. 1.94 hours