What is the mean absolute deviation of 4,6,2,8

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Iwill give you ! what is the measure of ∠v ?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827