The Purplemath Forums

hello!!! I have a word problem of which I do not understand. A company installs underground cable at a cost of $500 for the first 50ft and $5 for each additional foot thereafter. Express the cost C as a function of the length L of underground cable if L >50ft do anyone have a master technique that I...

hello eliz!!!!

I see your point!!! my problem is I am not sure how to set up the fuction.

hello eliz!!!

the calculation I came up with is

c=5l +500

I dont think that's quite right

my reasoning for the formula was simple. 500for the first 50 ft and 5 times for the extra length.
I see a pattern of which as the length increase by five. Is that what you referring to???

at some point L has to be greater than 50