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Answer:

The length of G'J' is 3.5 units

Step-by-step explanation:

Dilation by a scale factor of 1/2 reduces each side length by 1/2. The length of GJ is 7 units, as shown on the graph. G'J' has half the length of GJ, so we can divide the length of Gj by 2 to find our answer.

7/2 = 3.5

The length of G'J' is 3.5 units because it must be half the length of GJ.