Answer:
The dimensions are length 45 inches and width 20 inches.
Explanation:
Given:
A rectangle has an area of 900 square inches.
The length of the rectangle is 2.25 times the width.
Now, to find the dimensions of rectangle.
Let the width be
.
And the length be
.
So, putting the formula to get the dimensions:



Dividing both sides by 2.25 we get:

Using square root both sides we get:

Length = 2.25×20= 45 inches.
Width = 20 inches.
Therefore, the dimensions are length 45 inches and width 20 inches.