OK HELLO PEOPLE IM BORED AND IDK WANT TO BE FRIENDS?

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

For the sequence [tex]a_{n} = 2n/(n+1)[/tex], what is the value of [tex]a_{10}[/tex]