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 × 10-2
B. 2.51 × 10-2
C. 2.51 × 10-3
D. 3.98 × 10-3
Answer: D
Mathematics
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Convert as indicated.52.7 mm to decimeters
A. 527 dm B. 0.527 dm C. 5270 dm D. 5.27 dm
Mathematics
Locate the fraction on the number line.1
A.
1
B.
1
C.
1
D.
1
Mathematics
Solve the quadratic inequality by graphing an appropriate quadratic function.x2 + 7x ? -12
A. (-?, -4] ? [-3, ?) B. [-3, ?) C. [-4, -3] D. (-?, -4]
Mathematics
Fill in the blank with one of the words or phrases listed below.
The solution(s) to the equation x + 5 = x + 4 is/are 
.
A. no solution B. all real numbers C. unlike terms D. reversed
Mathematics