Answer:
642x115=73830
Step-by-step explanation:
does that help?

Actually Welcome to the Concept of the plots and graphs.
Since, the x axis varies from -infinite to +infinite,
here, the y totally varies from -5 to +5,
hence, the option B.) is correct.
===>

20x2 = 40 tip
240-40 = 200 rent for 2 busses
240/2 = 100 $ they can spend on each bus rental.