I need your help please I don’t understand this

The circumference of a circle is 5 pi cm. what is the area of the circle?

Which function has the domain x> -11?

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?