I’m really bad at math and really need on this

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

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?