Jacob is choosing a cell phone plan. If five messages cost $1 and 20 messages cost $4, what is the rate of change of the cost per message?
-$2 per message
$2 per message
-$0.20 per message
$0.20 per message
+4
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Home » Mathematics » Jacob is choosing a cell phone plan. If five messages cost $1 and 20 messages cost $4, what is the rate of change of the cost per message? -$2 per message $2 per message -$0.20 per message $0.20 per message