Subtract.10 - 11
A. -1
B. 21
C. -21
D. 1
Answer: A
Mathematics
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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. 1010 B. 10-10 C. 2.3 D. 0.1
Mathematics
If tan?<0 and sin?<0, in what quadrant does ? lie?
What will be an ideal response?
Mathematics
Evaluate as instructed.Use f(x) = x - 3 and g(x) = x + 3 to evaluate (fg)(-1).
A. 1 B. -2 C. -8 D. -10
Mathematics
Solve by completing the square.x2 - 4x - 21 = 0
A. -3, -18
B. -3, 7
C. -7, 3
D. ± 
Mathematics