Answer: 518
Step-by-step explanation:
Let's draw a vertical line to split the figure into two rectangles.
The rectangle on the left is 42 by 9, so its area is 42*9 = 378.
The rectangle on the right is 7 by 20 giving an area of 7*20 = 140.
Overall, the entire area is 378+140 = 518 square yards