Answer the question.The central angle of a regular polygon is an angle with vertex at the center of the polygon.Number of sides:4568Central angle:90°72°60°45°What is the measure of the exterior angle of a regular polygon with 20 sides?
A. 18°
B. 21.6°
C. 20°
D. 16°
Answer: A
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Solve the problem.The area of a circle of radius r is given by the polynomial ?r2, where ? is an irrational number. Use 3.14 as an approximation of ?, and find the area of a circle with radius 
A. 113.04 cm2 B. 18.84 cm2 C. 108 cm2 D. 37.68 cm2
Multiply. Write a mixed numeral for the answer.3
? 4
A. 15 B. 12 C. 10 D. 16
Solve the problem.The time between major earthquakes in the Alaska panhandle region is a random variable with probability density function 
for x in [0, ?), where t is measured in days. Find the probability that the time between a major earthquake and the next one is less than 200 days.
A. 0.7316 B. 0.0004 C. 0.0011 D. 0.2684
Solve using the addition and multiplication principles together.-83 = -10x - 3
A. -66 B. 11 C. 8 D. -70