Is this table proportional?

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

Find the area of the regular hexagon if a side is 20 cm.

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3