Given y varies directly as x, find the constant of variation k.​

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Astudent survey asked: "how tall are you (in inches)? " here's the data: 67, 72, 73, 60, 65, 86, 72, 69, 74 give the five number summary. a. median: 73, mean: 70.89, iqr: 5, min: 60, max: 74 b. 60, 66, 72, 73.5, 86 c. 60, 67, 72, 73, 74 d. 0, 60, 70, 89, 74, 100

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?