Question 79133
Let x=number of minutes a person could talk without exceeding $5

Cost of first minute = $0.25
Cost of remaining minutes = $0.10(x-1)---must subtract out first minute

So, our inequality to solve is:

$0.25+$0.10(x-1) is less than or equal to (<=)$5.00 -----------------ans
 
Lets go ahead and solve the inequality:

First we'll get rid of parens

$0.25+0.10x-$0.10<=$5.00  combine like terms
$0.15+$0.10x<=$5.00  subtract $0.15 from both sides

$0.10x<=$4.85  divide both sides by 0.10

x<=48.5 minutes-------------------round down to 48 min (why? because the cost is for each additional minute or portion thereof and if we rounded up, the inequality would no longer be less than or equal to 48.5)

CK

1st minute =$0.25

47 remaining minutes=($0.10*47)=$4.70

$4.70+0.25=$4.95  note that one more minute would break the bank


Hope this helps---ptaylor