Three identical coins, labeled a, b, and c in the figure, lie on three corners of a square 10.0 cm on a side. determine the x coordinate of each coin, xa, xb, and xc. (see figure.)

From the given figure we can see that the coin B lies at the origin with coordinates (0,0).

The coins A, B and C lie on the corners of a square. The length of all sides in a square are equal. The distance between B and C form a side of a square. So distance from B to C is 10 cm. Likewise, distance from B to A is also 10 cm.

B is located at point (0,0) and C is 10 units right of B, so coordinates of C will be (10,0).

A is located 10 units above B, so coordinates of A will be (0, 10). 

Therefore, the x-coordinates of A, B and C are 0,0 and 10 respectively.