The reliability of a new model of CD player can be described by the exponential function 
where the reliability R is the probability (as a decimal) that the CD player is still working t years after it is manufactured. Round the answer to the nearest hundredth. Then write your answer as a percent.What is the probability that the CD player will still work 
of a year after it is manufactured?
A. 85%
B. 52%
C. 18%
D. 72%
Answer: A
Mathematics
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What will be an ideal response?
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Collect like terms and write in descending order.4z7 + 8z8
A. 12z15 B. 12z7 C. 8z8 + 4z7 D. 12z8
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Insert parentheses as needed in the expression in order to make it equal to 0. More than one set of parentheses may be needed.15 + 3 ? 2 - 7
A. 15 + 3 ? (2 - 7) B. (15 + 3) ? 2 - 7 C. 15 + (3 ? 2) - 7 D. 15 + 3 ? 2 - 7
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Convert the units using unit fractions.6 wk = 
days
A. 360 B. 42 C. 84 D. 144
Mathematics