Jamie has $750 in her bank account. Each month, she has to pay her cell phone bill of $50. Write a rule (either explicit or recursive) to show how much money Jamie will have in her bank account after n months.

Question

karlaltr · Answer

n=number of months  so 750-50n

automaticloveletter · Answer

I know that

karlaltr · Answer

Oh okay, I think your teacher mightve just meant to write an expression:)

automaticloveletter · Answer

it says to write a rule...

bibby · Answer

then follow one of the billions of guides on writing a rule... http://mathbitsnotebook.com/Algebra1/Functions/FNSequenceFunctions.html

karlaltr · Answer

So are you supposed to write a sentence?

automaticloveletter · Answer

got it i think thanks bibster

bibby · Answer

recursive or explicit formula
either $f(n)=a_1+d(n-1)\\text{or}\a_1=750, a_n=a_{n-1}-50$

automaticloveletter · Answer

is it f(n)=750-50(n-1)?

bibby · Answer

l think so, I prefer the way the recursive one looks though

automaticloveletter · Answer

how would recursive look? f(n-1) 750-50?

bibby · Answer

$a_1=750\a_n=a_{n-1}-50$

automaticloveletter · Answer

wait why is the first term 750 shouldnt it be 700

bibby · Answer

maybe, ask someone else
I'm pretty sure it starts off at 750, but your thing makes sense

automaticloveletter · Answer

bc she starts off with 750 in her acc and has to withdraw 50 for the bill so the first month would be 700?

bibby · Answer

yeah, but my mind operates from a CS standpoint where you start counting at 0

bibby · Answer

I'm not sure

automaticloveletter · Answer

i mean maybe