I need a step by step explanation but I’d be ok with the solution.

Answer:
169. (m^2)
Step-by-step explanation:
lets first look at the smaller box. 7 x 7 is 49 so we have that answer. then 7 x 20 is 120. add those together and you get 169.
Answer:
The area of the composite figure is 189 square meters.
Step-by-step explanation:
First, partition the composite figure into 2 distinct shapes: a rectangle and a square on the top.
The formula for finding the area is: A = lw, or Area = length * width.
Area for figure number 1 (the square): 7 * 7 = 49
Area for figure number 2 (the rectangle): 20 * 7 = 140
Now, just add up both figures' areas, and find the answer:
140 + 49 = 189
I hope this somewhat helped. Have a great day!