Please help with the question below in the picture. WORTH 25 POINTS

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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

How do i get my dad to stop making me gargle his pickle i want my mom to gargle my pickle not my dads