Micaela and Trevon are selling wrapping paper for a school fundraiser. Customers can buy rolls of plain wrapping paper and rolls of holiday wrapping paper.

Micaela sold 2 rolls of plain wrapping paper and 1 roll of holiday wrapping paper for a total of $37.28. Trevon sold 7 rolls of plain wrapping paper and 7 rolls of holiday wrapping paper for a total of $182.28.

What is the cost each of one roll of plain wrapping paper and one roll of holiday wrapping paper?

Use a calculator to verify that σ(x) = 62, σ(x2) = 1034, σ(y) = 644, σ(y2) = 93,438, and σ(x y) = 9,622. compute r. (enter a number. round your answer to three decimal places.) as x increases from 3 to 22 months, does the value of r imply that y should tend to increase or decrease? explain your answer. given our value of r, y should tend to increase as x increases. given our value of r, we can not draw any conclusions for the behavior of y as x increases. given our value of r, y should tend to remain constant as x increases. given our value of r, y should tend to decrease as x increases.