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Tree diagram to find the prime factors of 18

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.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way