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Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

of the following words means "to make something unnecessary"? who talke constantlyor in na

How do refracting telescopes magnify a far away image? a. by directing light beams to meet at a focal point b. by absorbing light beams’ wavelengths c. by forcing light beams to change direction d. by measuring light beams’ velocity