A history teacher is writing a test worth 100 points. She uses multiple-choice questions worth six points each and true/false questions with two points each. She wants the test to have three times as many multiple-choice questions as true/false questions. Let M represent the number of multiple-choice questions on a test and let T represent the number of true/false questions which system of equations can be used to find how many of each type of question she should write?

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.