What is so delicate that even saying its name will break it

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.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?