Final answer:
The unit rate for On Call is $4 per hour, while for Talk Time, it's $3 per hour. These rates are found by dividing the total cost by the hours of service each company offers.
Step-by-step explanation:
The question asks us to determine the unit rate in dollars per hour for two pay-as-you-go cell phone companies, On Call and Talk Time. The unit rate is the cost per one unit of measure and is found by dividing the total cost by the number of units.
For On Call, which offers 2.5 hour of service for $10, the unit rate can be calculated as follows:
Unit rate = Total cost / Number of hours
Unit rate = $10 / 2.5 hours
Unit rate = $4 per hour
For Talk Time, which offers 1/4 hour (15 minutes) of service for $0.75, the unit rate can be calculated similarly:
Unit rate = Total cost / Number of hours
Unit rate = $0.75 / (1/4 hour)
Unit rate = $0.75 / 0.25 hours
Unit rate = $3 per hour
Therefore, the unit rate for On Call is $4 per hour and for Talk Time, it is $3 per hour.