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What is the value of x when x + 7 = 21?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

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