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 × 10-3
B. 2.51 × 10-3
C. 3.98 × 10-2
D. 2.51 × 10-2
Answer: A
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Use the horizontal line test to determine whether the function is one-to-one.
A. Yes B. No
Solve the problem.In a school survey, students showed these preferences for instructional materials. Answer the question. 
About how many students would you expect to prefer radio in a school of 250 students?
A. About 5 students B. About 90 students C. About 45 students D. About 13 students
Simplify.
A. 64k5 B. -4k5 C. 4k5 D. 4k18
The Richter scale converts seismographic readings into numbers for measuring the magnitude of an earthquake according to this function M(x) = log 
, where xo = 10-3.What is the magnitude of an earthquake whose seismographic reading is 7.6 millimeters at a distance of 100 kilometers from its epicenter?
A. 3.8808 B. 0.20281 C. 0.38808 D. 2.0281