2 equations:
37.5=5a+b
75=20a+b
We get: a=2.5, b=25
So, the linear function is: y=2.5x+25
The answer is 4,615.8 cubic centimeters
The volume of a cylinder is pi*radius^2*height
If pi is 3.14 and you plug in the radius (7cm) and the height (30cm), you get 3.14*7^2*30, which equals 4,615.8 cm cubed