What is the coefficient of -y/3​

What is the area of triangle abc if a = 8, b = 11, and c = 15?

When only separate discreet points are graphed it is called?

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?