She is in the 5th grade and we can’t figure out what part of the template we should use. God it’s been a long time.

Im not good in math and these 2 question have me stumped!

Given the Function defined by g(x)=5X-8, find g (1/5)

I dont know what to do! can you show me and explain?

also……

The cost of producing a newsletter is an initial charge of $100.00 for formatting and editing plus $0.25 for printing each copy. Answer the questions below.
a) Express the cost C(x) of printing the newsletters as a function of the number of copies printed, x.
C(x)=__________????? please explain and help

b) obtain values for the function when X=0, X=100, x=200, and x=300
C(0)=______???? i am going to assume this is 0
C(100)=_________
C(200)=__________
C(300)=_________

If i knew how or what C was it would be so hard