I don’t know how to do this type stuff so sorry hope someone els can help u tho
Answer:
Step-by-step explanation:
MATHHHHHHHH do u need help in math or what?
We are asked to determine the area of the given figure. To do that we will divide the figure into a square and a triangle. The area of the square is the product of its dimension, therefore, the area is:

The area of the triangle is given by the following formula:

Where "b" is the base and "h" is its height. Replacing the values:

The total area is the sum of both areas:

replacing the areas:
(7+x)+x=15
I did trial and error to get x=4.