Solve the problem.The function A = Aoe-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 800 pounds of the material are placed in the vault, how much time will need to pass for only 272 pounds to remain?
A. 140 years
B. 145 years
C. 280 years
D. 150 years
Answer: A
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Find the area or volume.Find the volume of the solid generated by revolving the region under the curve 
in the first quadrant about the y-axis.
A. 64? B. 8?3 C. 8? D. 4?
Provide an appropriate response.Multiply: 403 × 27
A. 10,161 B. 10,881 C. 1181 D. 1161 E. none of the above
Provide an appropriate response.
One end of a shaft 40 mm in diameter is milled as shown in the given figure. Find the radius of the smaller circle. 
A. 10 mm B. 5 mm C. 23.67 mm D. 20 mm
Evaluate the function for the indicated input and interpret the result.A(2, 22) where A(x, y) = 
. (A computes the average of two numbers x and y.)
A. A(2, 22) = 24 The average of 24 is the two numbers 2 and 22. B. A(2, 22) = 24 The average of two numbers 2 and 22 is 24. C. A(2, 22) = 12 The average of two numbers 2 and 22 is 12. D. A(2, 22) = 23 The average of two numbers 1 and 11 is 23.