Please help. pre-calc.

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Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

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)?

A. what does the point (4, 122) represent? b. what is the unit rate? c. what is the cost of buying 10 tickets?