Solve the problem.The function f(x) = 200(0.5)x/90 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. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 225 pounds
B. 147 pounds
C. 42 pounds
D. 44 pounds
Answer: B
Mathematics
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A function shows constant percentage decay. Which of the following may be the graph of this function? ?
A. ?
B. ?
C. ?
D. ?
Mathematics
Answer the question.The interior angles of a polygon are the angles under the points of the polygon.Number of polygon sides:456Sum of interior angles:360°540°720°What is the sum of the interior angles of a regular polygon with 9 sides?
A. 1260° B. 1170° C. 1350° D. 810°
Mathematics
Divide. Write your answer in lowest terms.2
÷ 
A. 5
B. 3
C. 6
D. 4
Mathematics
Give the quadrant in which the point is located.(
, - 
)
A. Quadrant II B. Quadrant I C. Quadrant III D. Quadrant IV
Mathematics