Help me pass this please

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?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Which of the following is the result of expanding the series