Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 3.98 x 10-9
B. 2.51 x 10-10
C. 2.51 x 10-9
D. 3.98 x 10-10
Answer: D
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Determine whether (f(g(x)) = x and whether (g (f(x)) = x.f(x) = 
, g(x) = x2
A. Yes, yes B. No, no C. No, yes D. Yes, no
Solve the problem.It takes 24 minutes to set up a candy making machine. Once the machine is set up, it produces 20 candies per minute. Use an inequality to find the number of candies that can be produced in 5 hours if the machine has not yet been set up.
A. at most 2400 candies B. at most 6720 candies C. at most 100 candies D. at most 5520 candies
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083
Below are graphs of difference equations of the form yn = ayn-1 + b. List the graphs which have the stated property.I.II.
?
III.IV.
?
unbounded
Fill in the blank(s) with the appropriate word(s).