How can you use knowledge of a minerals chemical make up or use

Which system of linear inequalites is represented by the graph?

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.

Somone me i want to know what 18 hours out of 24 hours in a fraction