Answer for me please

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

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position

Use sigma notation to represent the following series for 9 terms.