I need help quick please

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.

Determine domain and range, largest open interval, and intervals which function is continuous.

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale