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What is the rotational symmetry of a wheel

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse