Jennifer says that you can also write (12-3)x2for the phrase

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

With finding limits of multi variable !

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?