First you take the area,
4 x 2 = 8 cm
Then you take 72 cm and divide it by 8 cm to get your length
So the answer for the length is 9 cm
Slope = 3.1
This is in y =mx + b
Where m = slope
A graphing calculator working the quadratic regression problem for these three points gives the equation as
y = 2x² +7x -5
3/4 is greater than 1/2
7/10 is greater than 5/10
and 3/8 is less the 4/8 (4/8=1/2)