Solve the equation with the given roots 2x^4-19x^3+71x^2-109+39=0 roots 3 3+2i

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?