Solve for W, where W is a real number

Which of these tables represents a non-linear function?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

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?