Find the value of x below

With #! i’ve tried to figure it out but i can’t.

Someone me what is the area of this figure? 18m 18m 8m 16m

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?