Cathy pays $25 a month plus $0.05 per text message. She models this with the function C = 0.05x + 25. If the text messaging fee increases to $0.10 a minute, what is her new function?

Question

anonymous · Answer

don't know how to do it!!!!

snuggielad · Answer

do you understand how she layed out the eqation and why?

snuggielad · Answer

she has made an equation to find out her monthly costs...

anonymous · Answer

I think
is it c=.10x plus 25

snuggielad · Answer

OK...exactly...that is correct but here is the deal...i want you to know why...
we dont know how many texts she sends per month...it could be more or less... so we would use a variable to put in place that we could always change when we find out...
she pays a flat rate of $25 so that doesnt need a variable because she only pays it once...
So if they change their texting fees all you have to do is change the fee in front of the variable...so each month she has to pay
$25 plus how ever much each text costs in this case 10 cents or 0.10 but since she doesnt know at the beginning of the month she uses a variable x and that equals the cost or C...
now write that out...
$25+0.10x=c

snuggielad · Answer

Hit best answer dont forget