A survey of small businesses with websites found that the average amount spent on a site was $12,000 per year with a standard deviation of $4,000. Given a sample of 40 businesses, what is the margin of error if you are to assume a 95% confidence level

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

If value of cos330° is √3/2 then find tan165°.