A solution is an acid if its pH is less than 7 and a base if its pH is greater than 7. The pH is defined by 
where [H+] is the concentration of hydrogen ions in the solution. Use this information to answer the question.The concentration of hydrogen ions in a solution is approximately 10-7.5. What is the pH of the solution? Is the solution an acid or a base?
A. The pH is -7.5. The solution is a base.
B. The pH is -7.5. The solution is an acid.
C. The pH is 7.5. The solution is an acid.
D. The pH is 7.5. The solution is a base.
Answer: D
Mathematics
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A. 
= 
; 
= 
B. 
= 
; 
= 
C. 
= - 
; 
= 
D. 
= 
; 
= 
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Evaluate.12 - (-6)
A. -6 B. -18 C. 18 D. 6
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Solve the equation for all values 0 ? x ? 2?.sec 
= cos 
A. x = 
, 
B. x = 0, 2?
C. x = 0, 
, ?, 
D. x = 
, 
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Use interval notation to represent all values of x satisfying the given conditions.y = 6 - 2(2 - x) and y is at most 18.
A. [8, ?) B. (-?, 8) C. (-?, 9] D. (-?, 8]
Mathematics