Questions asked by Shell

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• How do I format an answer to make numbers line up directly underneath one another? I tried to to answer a synthetic division problem, but could not format it correctly. Using spaces does not work. TIA
  
• A 2.0m rectangular uniform slab of concrete is supported on 7 cylindrical rollers. If the slab is pushed to the right, how far can it move before it's center of gravity is to the right of the 7th roller, at which point it tips?