It means that -2.75 diopters of refraction must be interposed in front of your eye,
and added to the refraction of your cornea plus your natural lens, in order to cause
images to focus on your eye's retina.
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4 hrs 35 mins if you mean 275 mins
280% of 275 = 280% * 275 = 2.8 * 275 = 770
72% of 275 = 72% * 275 = 0.72 * 275 = 198
275 x 1 275 x 2 275 x 3 275 x 4 275 x 5 etc... The answers to all of those are divisible by 275
275 is divisible by the following: 275,25,11,5,1