a cellular phone company charges $10 for each phone plus $30 per month under a special sale plan. the total cost c (in dollars) of operating the phone is given by the linear model c(t)=10+30t, t is greater than or equal to 0 how many months would it take to have a total cost of $280

Question

a cellular phone company charges $10 for each phone plus $30 per month under a special sale plan. the total cost c (in dollars) of operating the phone is given by the linear model c(t)=10+30t, t is greater than or equal to 0    how many months would it take to have a total cost of $280

akausen · Answer

Wouldn't $280 be c, so that 280=10+30t, which could be solved for 9=t, or am I making this too simple?

anonymous · Answer

i don't think that's the right answer because it's multiple choice question and the choices that are given are 6 months, 8 months, and 10 months!! i tired so hard on it but i'm not getting the right answer!

akausen · Answer

Hmm, I'm sorry, I don't know what else to do! Good luck

akausen · Answer

It doesn't say anything about more than one phone, correct?

anonymous · Answer

thank you so much for your help...i really appreciate it and no thats the equation the way it is :(

elite · Answer

oreally

math&ing001 · Answer

Well you pay the cell bills at the beginning of the month, so technically you'll only need 8 months to get to a total cost of $280.

anonymous · Answer

You do $10+$30 x 12 months and you'll get the answer you want.