The solution to the system of equation 2x+3y=40 and y=x+10

Anyone know? will mark brainliest if correct!

Select the graph of the solution. click until the correct graph appears. |x| = 3

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?