Question

A cell phone plan charges a $40 base fee. If the total cost of talking 20 minutes is $41, what is the rate of change of the cost per minute talked?

Answer 1

-$20 per minute
-$1 per minute
-$0.05 per minute
- -$0.05 per minute

Answer 2

Well...

If the base fee is $40 and the total charged is $41, $41-$40=$1. So the cost of talking for 20 minutes was $1. You can find the cost per minute by dividing that cost by the number of minutes:\[\frac{ $1 }{ 20 minutes }\]

Answer 3

merci! c:

Answer 4

As a side note I have been listening to La Roux all day. >_>

Answer 5

lol. is good music. c: