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. 312
B. 287
C. 302
D. 297
Answer: C
Mathematics
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Solve the triangle. 
A. A = 51°, B = 87.2°, C = 41.8° B. A = 51°, B = 41.8°, C = 87.2° C. A = 41.8°, B = 87.2°, C = 51° D. A = 41.8°, B = 51°, C = 87.2°
Mathematics
Use a compass and straightedge to construct the image of ? ABC under the translation 
Mathematics
Solve the equation.
x + 7 = 
x - 8
A. 
B. 
C. 
D. 
Mathematics
Multiply. Write a mixed numeral for the answer.-4
? 
A. 12
B. 14
C. 12
D. 14
Mathematics