Based on the data from six students, the regression equation relating number of hours of preparation (x) and test score (y) is . The same data yield and What is the best predicted test score for a student who spent 4 hours preparing for the test

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55 degrees because 55+55=110 degrees

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

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