Question

sketch and label all possible rectangles with a perimeter of 30 cm and sides whose lengths are whole numbers

Answer 1

its asking you to draw rectangles with sides that equal 30 cm for example 

Answer 2

For example, you can draw a rectangle that has two opposite sides of 8, and the other two sides of 7. So they'll add up to be 8+8+7+7, which equals 30 (because the perimeter is all the lengths of the sides added up).