Assuming that L and d are known numbers, we can write.
[tex]W = \frac{49d + 91}{L}[/tex]
Remember that for a rectangle of width W and length L, the area is given by:
A = L*W
In this case, the area is 49d + 91, and the length is a known number, so we know the value of L.
Then we can write:
A = L*W = 49d + 91
To get the value of W, we need to isolate it on one side of the equation.
We can do that by dividing both sides by L.
[tex]W = \frac{49d + 91}{L}[/tex]
We assume that d and L are known, so with the above rational expression, we have W totally determined.
If you want to learn more about rational expressions:
https://brainly.com/question/1851758
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