With number 9. can you just tell me the coordinates and i'll just find the area of it ..

If we draw our rectangle from the bottom left corner starting at the origin, the first point will be (0,0).

Now for the rectangle to have a perimeter of 16, all the sides must add up to 16.

This can be achieved with sides of 5,5,3,3.

To get the next coordinate, lets move 5 units along the x-axis. This will put us at (5,0).

now 3 units up from there will give us (5,3)

Then -5 units along the x-axis from that point will give us (0,3)

Therefor the points are (0,0) (5,0) (5,3) (0,3)