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Rearrange the formula c^2 = a^2 + b^2 for b

Find solution of the linear equation y = 2/3x + 1/3

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas