Solve the problem.The half-life of a radioactive element is 130 days, but your sample will not be useful to you after 80% of the radioactive nuclei originally present have disintegrated. About how many days can you use the sample?
A. 297
B. 312
C. 287
D. 302
Answer: D
Mathematics
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Write as a common fraction.9.7
A. 
B. 
C. 
D. 
Mathematics
Round the number to the place indicated.Round to the nearest thousandth: 5.04406
A. 5.045 B. 5.043 C. 5.044 D. 5.0441
Mathematics
Perform the operation indicated. Simplify.
? 
A. 
B. 
C. 
D. 
Mathematics
Solve the inequality for the given f(x).f(x) = -3(x + 3) + 7, f(x) > -8
A. x < 2 B. x > 2 C. x < -2 D. x > -2
Mathematics