The radioactive element polonium decays according to the law 
where Q?0 is the initial amount and the time t is measured in days. If the amount of polonium left after 560 days is 40 mg, what was the initial amount present?
?
A. The initial amount was 645 mg
B. The initial amount was 642 mg
C. The initial amount was 651 mg
D. The initial amount was 640 mg
Answer: D
Mathematics
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Find the center of mass of a thin plate of constant density covering the given region.The region in the first and fourth quadrants enclosed by the curves 
and 
and by the lines 
and 
A. 
= 
, 
= 0
B. 
= 
, 
= 0
C. 
= 
, 
= 0
D. 
= 0, 
= 
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Consider these figures:
Which figure above, if any, is topologically equivalent to the given figure? Identify the topologically equivalent figure by letter.An apple
A. A B. B C. C D. None of these
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Provide an appropriate response.Change 23' 13" to a decimal part of a degree.
A. 0.39° B. 0.6° C. 0.01° D. 23.13°
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Solve the problem.
=
A. 74 B. 1 C. 75 D. 76 E. none of these
Mathematics