A cell was viewed under a microscope. The actual length of the cell is 0.025 mm. The magnification of the image is $\times 400$. What is the length of the cell in the image?
Explanation
The magnification of the image is x400, so the length of the cell in the image is 400 times the actual length of the cell, which is 0.025 mm. Therefore, the length of the cell in the image is 400 x 0.025 mm = 10 mm.
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