Can someone answer this for me please i’m desperate

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

Ihave trouble finding the nth term of a linear sequence

What number line represents the solution set for the inequality -1/2 greater than or equal to 4