Solve the problem.An electrical component has a lifetime given by the probability density function function 
where x is measured in hours. What is the probability that the component will work for at least 21 hours?
A. 0.811
B. 0.795
C. 0.827
D. 0.787
Answer: A
Mathematics
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Simplify.
2
A. 
B. 
C. 
D. 
Mathematics
Write the number in standard form a + bi.
A. 4 - i
B. 4 + i
C. 4 - 2i
D. 4 - i
Mathematics
Write the set in set-builder notation.{1, 3, 5 . . . }
A. {x|x is an odd number} B. {x|x is a whole number} C. {x|x is an integer} D. {x|x is an even number}
Mathematics
Solve the problem.Ariel, a marine biologist, models a population P of crabs, t days after being left to reproduce, with the function 
. Assuming that this model continues to be accurate, when will this population become extinct? (Round to the nearest day.)
A. 547 days B. 1512 days C. 911 days D. 707 days
Mathematics