Concrete tiles are made using buckets of sand, cement and gravel mixed in the ratio 1: 4: 6 how many buckets of gravel are needed for 4 buckets of cement.

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

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Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10