Use the pH scale to solve the problem. Use the given concentration [H+] of a substance to calculate the pH value of the substance and classify the substance as an acid or a base. Round to two decimal places.[H+] = 5.2 × 10-5
A. pH ? 5.72, base
B. pH ? 2.60, acid
C. pH ? 4.28, acid
D. pH ? 6.28, acid
Answer: C
Mathematics
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Find the function represented by the power series. 
A. - 
B. - 
C. - 
D. - 
Mathematics
Use the ratio test to determine if the series converges or diverges.
A. Converges B. Diverges
Mathematics
Determine whether the ordered pair is a solution for the given equation.y = 19 - 4x ; (4, 3)
A. Yes B. No
Mathematics
Solve.David recently switched to a long distance phone company which charges a monthly fee of $5.45 plus $0.08 per minute. A linear function that expresses the monthly bill B as a function of minutes used m is 
How many minutes were used for long distance if the long-distance phone bill was $23.05?
A. 288 minutes B. 220 minutes C. 231 minutes D. 200 minutes
Mathematics