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 × 10-4
B. 3.98 × 10-5
C. 2.51 × 10-4
D. 2.51 × 10-5
Answer: B
Mathematics
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Solve the problem.A size 12 dress in Country C is size 64 in Country D. A function that converts dress sizes in Country C to those in Country D is 
Find the inverse function.
A. f-1(x) = x - 20
B. f-1(x) = 
+ 20
C. f-1(x) = 
- 20
D. f-1(x) = 
Mathematics
Divide.
A. 96
B. -6
C. 6
D. - 
Mathematics
Find the vertices and the foci of the given ellipse.25x2 + 81y2 = 2025
A. V: (-81, 0), (81, 0);
F: (-9, 0), (9, 0)
B. V: (0, -9), (0, 9)
F: (0, - 2
), (0, 2
)
C. V: (0, -25), (0, 25)
F: (0, -5), (0, 5)
D. V: (-9, 0), (9, 0);
F: (- 2
, 0), (2
, 0)
Mathematics
Multiply and simplify. Assume that all variables represent non-negative numbers.(
+ 2)(
- 2)
A. 12
B. 4
C. 6
D. 8 - 2
Mathematics