If PI raises femur 4 mm and EX raises femur 2 mm, net change is:

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Multiple Choice

If PI raises femur 4 mm and EX raises femur 2 mm, net change is:

Explanation:
The action is additive when two factors move the same measurement in the same direction. Since both PI and EX raise the femur, you simply add their magnitudes: 4 mm + 2 mm = 6 mm. So the net change is a raise of 6 mm. (If the directions opposite, you’d subtract, but here both acts push in the same direction.)

The action is additive when two factors move the same measurement in the same direction. Since both PI and EX raise the femur, you simply add their magnitudes: 4 mm + 2 mm = 6 mm. So the net change is a raise of 6 mm. (If the directions opposite, you’d subtract, but here both acts push in the same direction.)

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