What is the factorization of 121b4

Ihave trouble finding the nth term of a linear sequence

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?

Shared decision making is always a positive strategy to take