The half-life of radium is approximately 1,600 years. If the present amount of radium in a certain location is 900 grams, how much will remain after 400 years? Express your answer to the nearest gram.
A. Q = 734 gram
B. Q = 768 gram
C. Q = 757 gram
D. Q = 752 gram
E. Q = 744 gram
Answer: C
Mathematics
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Decide whether the expression has been simplified correctly.60x = 6x
A. Not simplified correctly B. Simplified correctly
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Use the compound interest formula to determine the interest earned in the given period.P = $5600 at 9
% compounded continuously for 8 years
A. $2671.09 B. $17,816.24 C. $6616.24 D. $12,216.24
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Find an equation in standard form for the ellipse that satisfies the given conditions.Major axis endpoints (0, ±7), minor axis length 4
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
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