Which function best describes the increase in the population based on n years?

Find an equation of the line perpendicular to 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.

Just tell me how to set up the equation.