Find the average of the set of numbers.
and 
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem.Find the area of the region between the curve x = e13t , y = 
e-12t, and the x-axis from t = 0 to t = ln 9.
A. 9 B. 13 C. 8 D. 12
Solve the problem.A solid of constant density is bounded below by the plane 
above by the cone 
and on the sides by the cylinder 
Find the center of mass.
A. (0, 0, 
)
B. (0, 0, 
)
C. (0, 0, 
)
D. (0, 0, 
)
Solve.The monthly cost of a certain long distance service is given by the linear function 
where C(t) is in dollars and t is the amount of time in minutes called in a month. Find the cost of calling long distance for 80 minutes in a month.
A. $14.35 B. $15.95 C. $13.35 D. $6.40
Solve the problem. Round your answer to the nearest tenth, if necessary.Working together, Rick and Juanita can complete a job in 6 hr. It would take Rick 9 hr longer than Juanita to do the job alone. How long would it take Juanita alone?
A. 9 hr B. 6 hr C. 15 hr D. 3 hr