Negative, because Correlation and slope have the same direction (Sxy will be negative)
First subtract the installation price:
6855-85= 6,770
Then divide 6,770 by 24(12 months in 1 yr.):
6770/24= $282.08
Your monthly fee is $282.08
14*15 is 210 which his the entire area. now divide 210/20 you get 10.5 so you will need at least 11 bags
B
Two points is a line
One capital letter is the plane
The mean is 23.875. That would be roughly $24 each time