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 pH if the hydrogen ion concentration is 
A. 3.19
B. 3.81
C. 2.81
D. 2.19
Answer: D
Mathematics
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Divide numerator and denominator by the highest power of x in the denominator to find the limit.
A. 1,000 B. 100 C. does not exist D. 10
Mathematics
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves about the given lines.y = 2x,
y = x2; revolve about the y-axis
A. 
?
B. 
?
C. 
?
D. - 
?
Mathematics
Find the LCM.60, 40, and 50
A. 120 B. 300 C. 600 D. 200
Mathematics
Add or subtract as indicated.5 + (-9) - 2
A. 6 B. 16 C. -6 D. -2
Mathematics