Make an approximate conversion as indicated. Round to the nearest tenth. The precise value of your approximation will depend on the conversion path that you choose.3.9 ft = 
cm
A. 9.9
B. 153.5
C. 118.9
D. 99.1
Answer: C
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Write the conjugate 
of the complex number z. Then find z
.z = 
- 
i
A. 
= 
+ 
i, z
= 
B. 
= 
+ 
i, z
= 
C. 
= 
+ 
i, z
= 
D. 
= 
+ 
i, z
= 0
Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = (sin x)cos x
A. (sin x)cos x(cos x cot x - sin x ln (sin x)) B. cos x ln ( sin x) C. cos x cot x - ln (sin x) D. cos x cot x - sin x ln(sin x)
Solve the problem.Mara can type 2565 words in 
hour (45 minutes). How many words per minute can she type?
A. 43 words/minute B. 1924 words/minute C. 76 words/minute D. 57 words/minute
Solve the problem.The profit (in millions of dollars) for Allied Manufacturing can be approximated by 
where x is the year 1989 ? x ? 2009. Approximate the average rate of change over a 3-year period. Round your answer to three decimal places when appropriate.
A. -0.675 million dollars B. -6.285 million dollars C. 0.135 million dollars D. -0.885 million dollars