[grandkodiak]

well that question is 2 part. it wants the function to get the credits per semester... so f(x)=8x... meaning x is the number of semester you take...and since you get 8 credits per semester, the function is 8 times x. it then wants you to use that function to figure out how long it would take to finish. its simple math, but it wants you to figure it out using a function you create. i think youd get half or less credit if you just do it without involving a function...since the question seems to be aimed at your ability to think in terms of functions instead of stright up arithmetic.

so it would be (128-60)+f(x)=128 then (128-60)+8x=128... then 68+8x=128... 8x=68... x=8.5 semesters.

thats what i would write if i was given that question to ensure that i got credit for the questions as a whole.