What is the area of this circle? Show work please. The number in the circle is 3.

You sign up for karate classes. the classes cost $ 8 0 $80 per month. write an equation for the number of dollars, d d, that you pay for your karate classes if you take classes for m m months. complete the table for the missing values of d d. m m d d 1 1 8 0 80 2 2 3 3 4 4 3 2 0 320