Given that the cube root of 6.8 = 4.098, the cube root of 6.88 = 1.902, then the cube root of 6880 =? (please explain the reason) If two vertices of a triangle have been determined (that is, they cannot be moved), and the third vertex can be moved, will the degrees of the three angles change? (the angle code composed of two movable edges is a, and the others are B and C) Given the points a (a, 3), B (- 4, b), AB parallel to the X axis, find the values of a and B (please explain the reason)

&The first question is shown in the picture
Second, there must be changes
The third problem is that a is on the line y = 3 and B is on the line x = - 4. Because AB is parallel to the X axis, the coordinates of point B (- 4,3) and ab = 5 can be calculated according to the distance formula, that is, a = 1 and B = 3

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