Help me please, i need help in math

Yes8. (03.01)the range of a relation is (1 point)a set of points that pair input values with output valuesx and y values written in the form (x, y)the output (y) values of the relationthe input (x) values of the relation0description

Points j and k plotted on the coordinate grid are two vertices of rectangle jklm rectangle jklm has an area of 7 square units point j is located at 2,1 and point k is located at -5,1 each vertex of the rectangle is located at a point that has integer coordinates. what is the perimeter of rectangle jklm? (need answer asap)

The half-life of iodine-131 is approximately 8 days. find the amount of iodine-131 left from a 42 gram sample after 16 days. a: 10.5 grams b: 21 grams c: 0.0006 grams d: 34 grams