Volume of the 3d shapes to 1 decimal place (urgent )

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.

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Which of these triangle pairs can be mapped to each other using two reflections?