SOLUTION: Here's the math problem: Robert must select a monthly calling plan for local telephone service. Measured service: $9.91 per month plus 1.6 cents per min for local calls Unlimi

Question 990946: Here's the math problem:
Robert must select a monthly calling plan for local telephone service.
Measured service:
$9.91 per month plus 1.6 cents per min for local calls
Unlimited service:
$16.85 per month for local calls
How many minutes per month of local calls in Zone 1 is Unlimited service the most expensive?
Thank you so much to whoever helps!
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
let x be the number of minutes for Unlimited service the most expensive
9.91 + 1.6x < 16.85
1.6x < 6.94
x < 4.3375 minutes
therefore 4.3375 minutes, unlimited service is the most expensive

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