What is the period of the parent cosine function, y=cos(x)? degrees What is the period of the cosine function shown in the graph? degrees

Sara needs to take a taxi to get to the movies the taxi charges $4.00 for the first mile and then $2.75 for each mile after that if the total charge is $20.50 then how far was sara’s taxi ride to the movie

The graph shown is the graph of which function?

Solve for n? [tex]z = \frac{3}{4} mn[/tex]