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The last digit of the number 777 is

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John works 4-hour shifts at a call center. He earns $4 per hour and $4 per call. How many calls does he need to receive per shift to earn a total of exactly $400 in 4 shifts?
If the volume of a cube is x cubic meters and the total surface area of the cube is x square meters, then what is the length of all the cube's edges?