I need help with this math equation 3(2x + 6)

Renita analyzed two dot plots showing the snowfall during the winter months for city a and for city b. she found that the median snowfall is 5 inches less in city a than in city b. the mean snowfall is about 2 inches less in city a than in city b. which explains why there is a difference in the measures of center for the sets of data?

Combine the information in the problem and the chart using the average balance method to solve the problem.

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