Famous Mathematician- Euler

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Across
  1. 2. What subject, besides maths, did Euler study?
  2. 5. The formula he discovered was called 'Euler's' what?
  3. 7. At what age did he start at the University of Basil?
  4. 8. Where was Leonard Euler born?
  5. 9. Euler introduced symbols like (e). What is this called?
Down
  1. 1. What theory did he invent by solving the Seven Bridges if Konigsberg problem?
  2. 3. Which country was Euler from?
  3. 4. Which century was He born in?
  4. 6. What are of maths did he develop that helps find the 'best' solutions to problems?
  5. 8. Euler produced most of his work while he was what?