The function that represents the volume of the chest is (20x™x/3) + 40✓x.
From the information given, the area of the rectangular chest will be 20✓x/3. The volume of the chest will be:
= Base area × Height
= (x +6) × (20✓x/3)
= (20x✓x/3) + (20 × 6✓x/3)
= (20x™x/3) + 40✓x.
In conclusion, the function that represents the volume of the chest is (20x™x/3) + 40✓x.
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