Evaluate without using a calculator by using ratios in a reference triangle.cot 120°
A. 
B. -1
C. - 
D. - 
Answer: D
Mathematics
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Find the curvature ? for the given function.r(t) = (3t sin t + 3 cos t)i + 3j + (3t cos t - 3 sin t)k
A. ? = 3t
B. ? = - 
C. ? = 
D. ? = 
Mathematics
Evaluate the double integral over the given region.
R = {(x, y): 5 ? x ? 6, 5 ? y ? 7}
A. 132 B. 44 C. 88 D. 66
Mathematics
Solve the problem.A store owner finds that the demand function for a product he sells is 
where D(p) is the number of items that can be sold in one day at a price of p dollars. For what prices is the demand elastic? Inelastic?
A. Elastic: 0 < p < 6.50 Inelastic: p > 6.50 B. Elastic: p > 3.25 Inelastic: 0 < p < 3.25 C. Elastic: p > 13.00 Inelastic: 0 < p < 13.00 D. Elastic: p > 6.50 Inelastic: 0 < p < 6.50
Mathematics
Evaluate the improper integral.
A. 6 B. -36 C. -6 D. 36
Mathematics