Write a quadratic equation with roots of 1 3 and − 7 2 . a) y = 6x2 - 19x - 7 b) y = 6x2 + 19x - 7 c) y = 7x2 - 19x - 6 d) y = 7x2 + 19x - 6

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.