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The complete question describes the use of word problems to represent inequalities. The $21 means that there is a limit to the number of stops she can take using the train.
The inequality that represents this scenario is:

From the complete question, we have the following parameters:
Initial Fee = $5
Rate per stop = $2.75
Amount = $21
The inequality that represents the scenario is as follows:
Initial Fee + Rate * Number of stops <= Amount
We use <= because the total charges must not exceed the amount.
Let the number of stops be x.
The above formula becomes


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Answer:32cm
Step-by-step explanation:
Length=L
Area=64
Area=L x L
64=L^2
L^2=64
Take them square root of both sides
√(L^2)=√(64)
L=8
Perimeter of square=4 x L
Perimeter of square=4 x 8
Perimeter of square=32
Perimeter =32cm