The expression 1/3x^2-2 can be as 1/3(x-k)(x+k),where k is a positive constant. what is the value of k?

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Based on calculations, students should have 10.4 grams of powder after conducting an experiment. the students get these results: 10.2 grams, 10.4 grams, 10.3 grams, 10.4 grams, and 10.5 grams. which words best describe this data? check all that apply. a- accurate b- falsified c-invalid d-precise e-redundant