The graph shows sales in thousands of dollars for 1989 and 1990. Use it to answer the question. 
Which month in 2007 had the highest sales?
A. Month 12
B. Month 3
C. Month 5
D. Month 6
Answer: A
Mathematics
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Differentiate.
Mathematics
Solve the problem.Two pages that face each other in a book have 421 as the sum of their page numbers. What is the number of the page that comes first?
A. 209 B. 210 C. 211 D. 208
Mathematics
The figure below is a model of the Ferris wheel. The diameter of the wheel is 193 feet, and one complete revolution takes 17 minutes. Find the linear velocity of a person riding on the wheel. Give your answer in miles per hour and round to the nearest hundredth.
?
?
A. 0.45 mph B. 0.42 mph C. 0.49 mph D. 0.56 mph E. 0.41 mph
Mathematics
Find a value for K so that the following system of equations 
has exactly one solution.
Fill in the blank(s) with the appropriate word(s).
Mathematics