Answer:
The dimensions of Scarlett's new rectangle would be 11.25 inches long by 5 inches wide.
To calculate this, we multiply both the length and width of the original rectangle by 125%, which is equivalent to multiplying by 1.25.
This gives us 9 x 1.25 = 11.25 for the new length, and 4 x 1.25 = 5 for the new width.