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For the following, based on the information given which would you use to find the missing variable?

For the following based on the information given which would you use to find the missing variable class=
For the following based on the information given which would you use to find the missing variable class=
For the following based on the information given which would you use to find the missing variable class=
For the following based on the information given which would you use to find the missing variable class=