Find the average rate of change of f(x)=2x^2 - 2 from 2 to 6. The average rate of change of f(x)=2x^2 - 2 from 2 to 6 is ___. ( please answer fast, I have a time limit)

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?