Given
The parallelogram,
To find the area of the parallelogram.
Explanation:
It is given that,
The base of the parallelogram is 10 inches.
And, the height of the parallelogram is 5 inches.
Therefore,

Hence, the area of the given parallelogram is 50 in^2.
X=23
I say this because you can see that the scale factor is 3 due to just visually scaling both the long and short leg from the original triangle to the dilated triangle. Dividing 39 by 3 is 13, and doing it in reverse. Adding 10 would equal 23, the initial value. So that'd be the missing value.