How to solve these, what do i solve first? or do i input the numbers in the place of x?

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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)?

W-16=-12 solve each one step equation plz