Help asap please!! <3

The area of square garden is 300m squared. how long is the diagonal?

What is the distance between point a and b

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?