I am calculating three numbers to get the average, but I don't think I am doing it correctly. I am adding the three numbers then dividing that number by 3 for the average (as I have three numbers). Is this correct?

(40 points) i need some . an answer definition is appreciated as well.

Which unit of measure would be the most appropriate to measure the capacity of a bottle of nail polish? a.fluid ounces b.cups c.pints d.quarts e.gallons

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field