Find the derivative of the function.y = ecos x
A. 
= -esin x
B. 
= sin x ecos x
C. 
= -cos x esin x
D. 
= -sin x ecos x
Answer: D
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Perform the indicated operations.Estimate by rounding to the nearest thousand, then find the actual sum.
A. Estimate: 49,000 Actual: 47,615 B. Estimate: 47,000 Actual: 48,364 C. Estimate: 47,000 Actual: 47,639 D. Estimate: 48,000 Actual: 47,645
Solve the inequality.x2 + 2x ? 0
A. (-?, -2] or [0, ?) B. [-2, 0] C. [0, 2] D. (-?, 0] or [2, ?)
The number of laptop computers sold each month for one year was recorded by an electronics store. The results were 15, 17, 15, 25, 26, 7, 9, 15, 20, 23, 27, and 15. Calculate the mean number of laptop computers sold per month. Round your answer to one decimal place.
A) 16.0 laptop computers B) 19.2 laptop computers C) 17.8 laptop computers D) 15.2 laptop computers E) 15.0 laptop computers
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 800 pounds of the material are initially put into the vault, how many pounds will be left after 160 years?
A. 519 pounds B. 250 pounds C. 640 pounds D. 264 pounds