Whats x-3+75x compared to or equal to x-75+3x

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

Which math sentence can be used to determine if the triangle is a right triangle?

Can someone me i’m confused. will give brainliest and a whole bunch of points