Find the integral.
A. - 
cos 3x - 2x sin 3x + C
B. - 
cos 3x - 2x sin 6x + C
C. - 2 cos 3x - 6x sin 3x + C
D. - 
cos 3x - 2 sin 3x + C
Answer: A
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Solve the problem.In a survey of 1000 Americans, 850 said that they own a cell phone. Assume that the survey was properly conducted and that the 1000 people surveyed represent an unbiased sample of the entire population. Estimate the standard error for this survey.
A. ? 12.75% B. ? 11.1% C. ? 0.1% D. ? 1.1% E. ? 11.3%
Name the property illustrated by the statement.-(-5) = 5
A. Double Negative Property B. Inverse Property of Multiplication C. Identity Property of Multiplication D. Commutative Property of Multiplication
Subtract.(-2r4 + 9r3 - 3r) - (8r4 - 9r3 + 6r2 - 2r)
A. 6r4 + 6r2 - r B. -10r4 + 18r3 - 6r2 - r C. -6r4 - 6r2 + r D. 10r4 - 18r3 + 6r2 + r
Solve the problem.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 700 pounds of the material are placed in the vault, how much time will need to pass for only 431 pounds to remain?
A. 80 yr B. 140 yr C. 70 yr D. 75 yr