The sum of 2 positive numbers is 151. the lesser number is 19 more than the square root of the greater number. what is the greater number?

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?