All real numbers more than 4 units from 6

How do you find the area of a triangle

Does anyone know how to do geometryme with this problem

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?