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 H+ represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. 2.8
B. 3.8
C. 2.2
D. 3.2
Answer: A
Mathematics
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First determine which number (x or y) is more accurate, then which is more precise.x = 8070, y = 0.004
A. y, x B. y, y C. x, x D. x, y
Mathematics
Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.A = 
?r2 for r
A. r = 
B. r = 
C. r = 
D. r = 3
Mathematics
Solve the problem.In how many ways can you answer the questions on an exam that consists of 7 multiple choice questions, each of which has 3 answer choices?
A. 3027 B. 2187 C. 1957 D. 343
Mathematics
Use the graph of f to sketch a graph of the inverse of f using a dashed curve.
A. 
B. 
C. 
D. 
Mathematics