Round the following number to the thousans’s place. 409,620

Marie drew the triangle shown. she wants to draw a second triangle that is different from this one. use the drop-down menus below to complete the statements about the second triangle.

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

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