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 10-9
C. 2.51 x 10-8
D. 3.98 x 10-8
Answer: A
Mathematics
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Factor completely.36k2 - 121m2
A. (36k + m)(k - 121m) B. (6k + 11m)2 C. (6k + 11m)(6k - 11m) D. (6k - 11m)2
Mathematics
Simplify.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Use Newton's Law of Cooling to find the temperature in the following case. A glass of water with a temperature of 7°C is placed in a room with a temperature of 20°C. One minute later the water has warmed to 8°C. After how many minutes does the water have a temperature that is 80% of the ambient temperature?
A. ? 22 min B. ? 26 min C. ? 15 min D. ? 18 min
Mathematics
Evaluate the expression.
; when y is 2 and z is 4.
A. 0
B. 
C. 16
D. undefined
Mathematics