Dividing algebraic fractions
8/9-a^2 divided by 4a^2-4a-24/a^2-6a+9

The sixth grade art students are making a mosaic using tiles in the shape of right triangles.each tile has leg measures of 3 centimeters and 5 centimeters.i f there are 200 tiles in the mosaic what is the area of the mosaic.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Ineed to know the answer to this algebra question.