What is the radius of a circle with the circumference 81.64

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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)?

Pls brainliest will be awarded if answer is correct