Solve the problem.Suppose that during a certain step in a chemical manufacturing process the amount of chlorine dissolved in a solution, measured in parts per million (ppm), is related to the elapsed time measured from the beginning of the step. Use the following table as a representation of this relationship. Write the data from the table as ordered pairs (x, y), where x represents the time and y represents the amount dissolved.
A. (3, 24.0), (6, 26.4), (9, 28.4), (12, 30.4), (15, 32.2)
B. (1, 24.0), (2, 26.4), (3, 28.4), (4, 30.4), (5, 32.2)
C. (24.0, 3), (26.4, 6), (28.4, 9), (30.4, 12), (32.2, 15)
D. (0, 24.0), (3, 26.4), (6, 28.4), (9, 30.4), (12, 32.2)
Answer: A
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Fill in the blank(s) with the appropriate word(s).
The post office recorded the weights of packages sent on a particular day and used the results to construct a histogram. Use the histogram to solve the problem. 
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A. 11 packages B. 7 packages C. 6 packages D. 13 packages