Where C is the circumference of a circle and r is its length of radius, the approximate value of the ratio C : r is:
A. 1.57
B. 3.14
C. 6.28
D. 12.56
Answer: C
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Solve the application and answer with a complete sentence.Participants in a memorization experiment were able to recall an average of d digits in x minutes, where 
Find the number of digits recalled after 5 minutes.
A. 78 digits are recalled. B. 58 digits are recalled. C. 38 digits are recalled. D. 98 digits are recalled.
Convert the following to rectangular form.
a. 9/_43ø_ b. 13/_-22ø_
Use the pictograph to answer the question.This pictograph shows projected sales of compact disks (CDs) for a popular rock band for seven consecutive years. 
? = 1000 CDsApproximately how many fewer CDs will be sold in 2001 than in 2003?
A. 4 CDs B. 5000 CDs C. 4000 CDs D. 6000 CDs
Graph the system of inequalities. Shade the region that represents the solution set.x2 + y2 ? 25y ? 4x
A. 
B. 
C. 
D. 