HELP PLZ I NEED TO GET THIS TEST DONE AND IM SO LOST can someone help me with the answers?

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

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 price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?