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

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16