Are my answers correct? Quadratic and logarithmic modeling

[MarkFL]

the graph was going to be my next question! - sorry for being a pain in the butt. :p

How would would i put my answers into WA?

Use the command:

y=x^2/2+20,y=30+ln(x+1)/(2ln(2)) where x=0 to 8

 

[needalgebra]

why is logarithmic model pretty much staying the same...

they're both supposed to go up by 50 cents, same amount.

im confused

 

[MarkFL]

The both go up by 50 cents for the first gigabyte, but only a linear function will change at a constant rate.