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 × 10-3
B. 2.51 × 10-3
C. 2.51 × 10-2
D. 3.98 × 10-2
Answer: A
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Give an appropriate answer.Given the function f(x, y) and the positive number ? as in the formal definition of a limit, find a positive number ? as in the definition that insures 
< ?.f(x, y) = (1 + cos x)(x + y); ? = 0.12
What will be an ideal response?
Use a calculator to find the approximate value of the expression rounded to two decimal places.sec 
A. 1.00 B. 0.87 C. 1.04 D. 1.17
Use the graph of the function to find the following: a. the domain and range of the function; b. the intercepts, if any; c. the intervals on which the function is increasing, decreasing, or is constant; d. whether the function is even, odd, or neither.
What will be an ideal response?
Let 
and 
. Does 
style="vertical-align: middle;" />? ? A. Yes B. No