Find the indicated set.Let A = {2, 7, 9, 12, 15}, B = {3, 9, 11, 15, 20}, and C = {4, 8, 9, 10, 12, 14}.Find 
A. {9, 12, 15}
B. {9}
C. {9, 12}
D. {2, 3, 4, 7, 8, 9, 10, 11, 12, 14, 15, 20}
Answer: B
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 
for r(t) = 2sec2(t)i - 2tan(t)j + 9t2k
A. v
= 8i + 4j - 
?k
B. v
= 8i - 4j + 
?k
C. v
= -4j - 
?k
D. v
= -4j + 
?k
Solve the problem.How long will it take for the population of a certain country to double if its annual growth rate is 7.7%? Round to the nearest year. Use the exponential growth model 
A. 26 yr B. 9 yr C. 1 yr D. 4 yr
Solve.A plane makes a 240-mile trip against a head wind in 1 hour and 30 minutes and returns, with a tail wind of the same speed, in 1 hour. What is the speed of the wind?
A. 80 mph B. 200 mph C. 160 mph D. 40 mph
Classify the following quadrilaterals. Match the shape with the name.1. 
2. 
3. 
4.
src="https://sciemce.com/media/3/ppg__cognero__Section_9.6_Quadrilaterals_and_Other_Polygons__media__9fd8077d-5394-4248-ba8b-b0b2ad7c55fc.PNG" width="186px" height="117px" style="vertical-align:-58px;" /> A. square B. trapezoid C. rectangle D. rhombus