Solve the problem.The function A = A0e-0.0077x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 900 pounds of the material are initially put into the vault, how many pounds will be left after 30 years?
A. 714 pounds
B. 150 pounds
C. 113 pounds
D. 1350 pounds
Answer: A
Mathematics
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Use the formula for simple interest, I = P × r × t, to find the missing quantity.I = $1665; P = $5550; r = 6%
A. t = 6 years B. t = 8 years C. t = 5 years D. t = 7 years
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Write the sum or difference as a product containing only sines and/or cosines.cos 
+ cos 
A. 2 sin(2?) sin 
B. 2 sin(2?) sin ?
C. 2 cos(2?) cos 
D. 2 cos(2?)
Mathematics
Solve the inequality. Give the solution set in both interval and graph forms.6 ? 
? 9
A. 
 ? |  |
B.
, 
-  |  |
C.
 ? |  |
D.
-  |  |
Mathematics
Find the length of the arc on the circle of radius r meters intercepted by a central angle ?. Round your answer to three decimal places.r = 5, ? = 55°
A. 3.84 m B. 4.32 m C. 4.8 m D. 5.28 m
Mathematics