Answers edited by Keith K.

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• Weight of object at earth surface is 10 kg. Find the weight of object at the centre of earth?
  
• Cashews at $7.40 a pound are mixed with peanuts at $2.60 a pound. If there are 18 pounds in the mixture and the mixture sells for $5.80 per pound, how many pounds of cashews are there in the mixture?
  
• How do you write 34,900 in scientific notation?
  
• How do you factor #2x^2y-4xy-30y#?
  
• What advancements did Galileo make in the history of telescopes?