Find the exact value of the expression. Do not use a calculator.cot 
- cos 
A. 
B. - 
C. - 
D. 
Answer: B
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = (9t sin t + 9 cos t)i + (9 t cos t - 9 sin t)j ; -2 ? t ? 5
A. 189 B. 130.5 C. 261 D. 94.5
Solve the problem.A drug company establishes that the most effective dose of a new drug relates to body weight as shown below. Let body weight be the independent variable and drug dosage be the dependent variable. Use a graphing utility to draw a scatter diagram and to find the line of best fit. What is the most effective dosage for a person weighing 120 lbs? 
A. 13.38 mg B. 10.07 mg C. 12 mg D. 26.39 mg
Find the rate as a ratio of distance to time. Round to the nearest hundredth where appropriate.450 m, 45 sec
A. 10 
B. 45 
C. 55 
D. 450 
Find the first 4 terms of the recursively defined sequence.a1 = 6, an + 1 = (an)2
A. 6, 36, 216, 1296 B. 6, 12, 24, 48 C. 6, 4, 9, 16 D. 6, 36, 1296, 1,679,616