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Value of a is4and value of YZ is20 unitsStep-by-step explanation:Given:Y is between point X and ZValue of line XY = 7aValue of line YZ = 5aValue of line XZ = 6a + 24Find:Value of "a" and line YZComputation:We know thatXY + YZ = XZSo,7a + 5a = 6a + 2412a = 6a + 246a = 24a = 4Value of a = 4So,Value of line YZ = 5aBy putting value of aValue of line YZ = 5(4)Value of line YZ = 20 unitsLearn more;brainly.com/question/18983323?referrer=searchResults...