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. 297
C. 302
D. 287
Answer: C
Mathematics
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Solve.How many lines are determined by 18 points, no 3 of them being collinear?
A. 18 B. 153 C. 2448 D. 306
Mathematics
Write the quotient in the form a + bi.
A. 
- 
i
B. 
+ 
i
C. 
+ 
i
D. 
- 
i
Mathematics
Triangle ABC is described below. Find all possible values for B, C, and c.
?
cm, 
cm
?
Apply the rules regarding the use of significant digits to each angle and length after all computations are complete.
?
A. 
cm or 
cm
B. ?
cm or 
cm
C. 
? cm
D. 
? cm
E. no solution
Mathematics
Answer the question.True or False? The y-coordinate is positive in quadrants I and IV.
A. False B. True
Mathematics