The function f(m) = 0.22m +50, represents the total cost of renting a car as a function of the miles driven. If the total cost is $142.40, how many miles was the car driven?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?