Posted by **abigail** on Friday, October 28, 2011 at 5:29pm.

a phone company charges a flat monthly fee of $15 for cell phone services, plus an additional fee for every minute you talk. in a given month, you are charged $36 for the 24 minutes you talked( not including the $15 flat fee.) let the total cost be c(in $) and the time you talk be t(in minutes)

how do i find the dependent and independent variables, and the "fixed" cost of the phone plan, and what cost do you pay per minute. and how do i write an equation relating c and t

- geometry -
**Steve**, Friday, October 28, 2011 at 6:02pm
how is this geometry?

The independent variable is the one that can change by itself. In this case, the number of minutes you talk: t.

c = fixed bill + minute rate*t

The charge for each minute = $36/24 = 1.50 (pretty pricey!)

c = 15.00 + 1.50t

- geometry -
**Marie**, Wednesday, December 10, 2014 at 8:02pm
how would you write an equation for a phone that cost $30 plus 30 cents per minute

- geometry -
**Squad**, Wednesday, December 10, 2014 at 8:03pm
how would you write an equation for a phone that cost $30 plus 30 cents per minute

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