Answer: Yes
Step-by-step explanation: The answer of 1400 is correct.
What I did is I found the area of the figure assuming it was a rectangle, then I subtracted the corners that were removed.
1800 - 150 - 100 - 150 = 1400
Area of a parallelogram = base x height
So, 10.5 x 7 = 73.5
Perimeter = 18 = 8 + 2x + 3x
10 = 5x
x = 2
So the sides are 8, 4 and 6