Solve the problem.City A has an elevation of 15,054 feet above sea level while city B has an elevation of 16,383 feet below sea level. Find the difference in elevation between those two cities.
A. 31,537 ft
B. 1329 ft
C. 1429 ft
D. 31,437 ft
Answer: D
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Find the product. Write your answer in simplest form.16
? 
A. 
B. 3
C. 12
D. 
Find the opposite of the expression.-5x2 + 2x + 16
A. 5x2 - 2x - 16 B. 5x2 - 2x + 16 C. -5x2 + 2x + 16 D. -5x2 - 2x - 16
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. 707 days B. 547 days C. 1512 days D. 911 days
Solve the problem.
Computer experts warn that writable compact disks such as CD-Rs (Compact Disc-Recordable) and CD-RWs (Compact Disc-ReWriteable) have much shorter lifespans than other digital storage methods such as hard drives or magnetic tape. The time until the disc becomes unreadable for a particular brand of CD-RWs is a continuous random variable with probability density function given by the following function. Round to two decimal places. f(x) = 
(A) What is the probability that a disc is not readable after 25 years?
(B) What is the probability that the disc is readable after 10 years?
(C) If the user wants the probability that the disc is readable to be 0.9, when is the last time it should be read?
What will be an ideal response?