The following stem-and-leaf plot gives the heights of the 20 highest mountains in two continents. Use the plots to answer the question. 
Find the mean of the heights of the 20 highest mountains in Continent X.
A. 14,420 feet
B. 14,650 feet
C. 15,002 feet
D. 14,800 feet
Answer: B
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Solve the problem.A company adopts an advertising campaign to weekly add to its customer base. It assumes that as an average fifty percent of its new customers, those added the previous week, will bring in one friend, but those who have been customers longer will not be very effective as recruiters and can be discounted. A media campaign brings in 10,000 customers initially. What is the expected total number of customer with whom the company can expect to have dealings?
A. 15,000 B. 30,000 C. 20,000 D. The sum diverges to infinity.
Establish the identity.sin
= -cos ?
What will be an ideal response?
Find the derivative.f(x) = ex log3?x?
A. ex + 
B. ex log3?x? + 
C. ex log3?x? + 
D. ex log3?x? + 
Find the reference angle of the given angle.18°
A. 108° B. 72° C. 18° D. 162°