Ineed with can someone . tell me if i’m right.

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

Solve: 3x+y=6 4x-2y=18 show all work !

If square root x = -7, then x= -49 true or false