Given:
Height of rectangle = 4 units
Area of rectangle up to 48 square units.
To find:
The inequality which represents all the possible lengths in units of the bases.
Solution:
Let the possible lengths in units of the bases be b.
Area of rectangle = Length × width
Here, Height of rectangle = width = 4 units. So, area of rectangle is


Area of rectangle up to 48 square units. It means the area should be less than or equal to 48 square units.

Divide both sides by 4.


Length can not be negative or zero.

Therefore, the required inequality is
.