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. 2.51 x 10-3
B. 3.98 x 10-3
C. 2.51 x 10-2
D. 3.98 x 10-2
Answer: B
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Graph the polar equation.r = 8 sin 2?
A. 
B. 
C. 
D. 
Find the reference angle of the given angle.-57°
A. 123° B. 33° C. 57° D. 147°
Evaluate the discriminant, and predict the type and number of solutions.t2 - 14t + 49 = 0
A. 0, one rational B. -392, two different imaginary C. 392, two different rational D. 392, two different irrational
a) Find correlation coefficient to the set of data. Round the answer to 4 decimal places if necessary.
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r = __________
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b) Find correlation coefficient to the set of data. Round the answer to 4 decimal places if necessary.
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r = __________
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c) Find correlation coefficient to the set of data. Round the answer to 4 decimal places if necessary.
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r = __________
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Use correlation coefficients to determine which of the given sets of data is best fit by its associated regression line.
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__________
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Use correlation coefficients to determine which of the given sets of data is worst fit by its associated regression line.
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__________
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Is it a perfect fit for any of the data sets?
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__________
What will be an ideal response?