Asandbox has a perimeter of 21 1/2 feet. if the length is 5 1/4 feet, what is the area of the sand box?

For how answer my question this will be the last question can you answer in math subject

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a.the profit when the unit price is equal to 0b.the unit price(s) when the profit is equal to 0c.the profit when the unit price is greatestd.the unit price(s) when profit is greatest

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?