Please help me very important question.

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

What is the area of the triangle 10 13 12

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?