when magnified 1000 times by an electron microscope , the image of a certain circular piece of tissue has a diameter of 0.3 centimeter . the actual diameter of the tissue , in centimeters , is
Choose the correct choice: A) 0.005 B) 0.002 C) 0.001 D) 0.0003 E) 0.0002

Rationale: it is very easy if x is the diameter , then the magnified length is 1000 x . ince 1000 x = 0.3 then x = 0.3 / 1000 = 0.0003 . the answer is d
Answer: D