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No, a twin box spring is not large enough. It would take 2 extra long twin box springs (80 inches in length, as opposed to a regular twin's length of 75 inches), as a kings size mattress is 80 inches long and 76 inches wide (which is twice the width of two twin box springs). Keep in mind that 76x80 is the measurements of an eastern king size mattress, as a western or "California" king mattress measures 72x84 inches.
No, it doesn't require box springs. My roomate just sleeps on his on the floor. There are many options of what you can put underneath your memory foam mattresss.
They will not. A queen size bed is 60" x 80" and a twin size is 39" x 75" and an XL twin would be 39" x 80". Two XL twin box springs are what you would use for a king size bed.
It depends on the condition of the box spring and the design. For example, if there are metal support bars on your box spring, you will feel them through your memory foam topper.
"Box spring mattresses come in different sizes. There are single, double, queen and king mattress. When you go from a single to a queen or king mattress, the width and length both change. A twin measures at 39x75. A queen measures at 60x80 and a king is 76x80 inches."