A rectangle frame has a length of 3 1/8 feet and an area of 2 3/4 square feet. what is the width w, in feet, of the frame?

I think you have the area and length swapped if that's true, continue:

3.125 divided by 2.75 is 1.13 (continues on with 36 repeating)

this means that 1.13 Feet is the width because you basically take the equation backwards:

L*W=A

therefore,

A/L=W

or

A/W=L

A = L * W

2 3/4 = 3 1/8 * W

Change to improper fractions.

11/4 = 25/8 * W

Multiply both sides by the reciprocal of 25/8 (8/25) to clear the fraction with the W.

(8/25) (11/4) = W

88/100 = W

22/25 = W OR 0.88ft