Answer:
C
Explanation:
So to do this problem, first find the area of the figure before you apply the scale factor, and then multiply that by 49. The reason you multiply it by 49 and not 7 is because you're multiplying both the length and the width of the figure by 7, so you have 7 * 7 = 49.
The area of the figure to start is 10 (you can find this by simply counting the blocks).
Then, 10 * 49 = C. 490 units squared.
hope that makes sense!