Posted by Jo on Tuesday, January 29, 2013 at 9:31pm.
Denise's cell phone plan is $29.95 per month plus $.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is $99.95. For how many minutes was she billed? Answer is 700 but what is the algebraic equation?

Algebra Problem Solving  Reiny, Tuesday, January 29, 2013 at 10:47pm
cost = .10(m300) + 29.95 , where m is the number of minutes
so ....
.10(m300) + 29.95 = 99.95
.1m  30 = 70
.1m = 100
m = 100/.1 = 1000
She used 1000 minutes, but is only billed for any time over 300 minutes , look at (m300) in the equation.
She was billed for 700 minutes
btw, the equation is only valid for m>300
if m<300
it would simply be
cost = 29.95
Answer This Question
Related Questions
 algebra  I need to write an equation for the following: Denise's cell phone ...
 Algebra ASAP  I a working wth a cell phone performance task project. I have to ...
 math  73. Cell Phone Plan A cell phone plan costs $3.95 per month plus $0.07 ...
 math  Verizon has a cell phone plan for $28.00 per month plus $.30 per minute ...
 Geometry  Horizon has a cell phone plan for $28.00 per month plus $.30 per ...
 Math ASAP  Verizon has a cell phone plan for $28.00 per month plus $.30 per ...
 prealbegra word problem  I need to write a verbal rule to determine the total ...
 Math  I have the same problem as Marita. Can someone tell us what equation to ...
 Algebra Please!  Posted by Thomas M on Monday, March 9, 2015 at 4:12am. I am ...
 math  A cell phone company charges by the minute (and partial minute) for a ...
More Related Questions