Given the two rectangles below. Find the area of the shaded region.

Answer:
75 units²
Step-by-step explanation:
Bigger rectangle: length * width
: 10 * 9
: 90 units²
smaller rectangle: length * width
: 3 * 5
: 15 units²
Shaded region = Bigger rectangle - smaller rectangle
= 90 units² - 15 units²
= 75 units²