Answer: 36
Explanation:
to find the length, find the hypotenuse of a triangle formed by the x-axis and the distance the parallelogram is from the x-axis.
hypotenuse=

the distance from -6 to -3 is 3 units
the distance from 0 to 4 is 4 units

then

therefore the length of the parallelogram is 5 units
repeat on other side
the distance from -3 and 9 is 12 units
the distance from 0 and 5 is 5 units

then

therefore the width of the parallelogram is 13 units
now to find the perimeter add all side lengths of the given shape
since parallelograms have equal lengths and widths add 13+13+5+5
therefore the perimeter of the parallelogram is 36