Can someone please help me with this bewgvfryyyc jdbcvheriuv cwdsvbksf ihbevnosld vjawsbdifjfdn

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Which value is not a solution of 8x^3 – 1 = 0

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.