Give the equation of a line that has no x-intercepts no y-intercepts an infinite number of y-intercepts a point that is both the x-intercept and the y-intercept

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?