Find the value of x, please help me

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Based on what i know about mean, this doesn't add up.

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.

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t