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. 297
D. 302
Answer: D
Mathematics
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Provide an appropriate response.Perform the indicated operations: 5
- 
+ 7 × 
A. 105 B. 177 C. -213 D. -45
Mathematics
Use the LCD to simplify and solve.
(r + 6) = 
(r + 8)
A. 3 B. -4 C. 4 D. 6
Mathematics
Factor the binomial completely. If it is prime, say so.x4 - 256
A. (x2 - 16)(x + 4)(x - 4) B. (x2 + 16)(x + 4)(x - 4) C. (x + 4)2(x - 4)2 D. Prime
Mathematics
Fill in the blank with one of the words or phrases listed below. 
A combination of operations on variables and numbers is called a(n) 
.
A. average B. expression C. equation D. absolute value
Mathematics