Aquarium 8 ft long 4ft wide and 6 ft tall. If 2 ft of water is already filled how much water must be added to fill up to 5ft?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

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Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?