Questions asked by Gió

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• Is it possible to answer a question referring to the answer of another person BUT giving him the credit? Sometimes there are answers so good and well explained that it is a pity to change them or give a new one.
  
• Is there a program to plot and show 3-D graphs easily? I need to show vectors in the #xyz# space to my pupils and my drawings are terrible!!! Thanks.
  
• Someone knows the meaning of this kind of question? How much greater is (9x6−4)+(10x5−15x4+14)?
  
• Was the Renault FT-17 light tank actively used in combat during WWI? If yes, in what battle(s)?
  
• Is it possible to add two (different) complex numbers given in trigonometric form directly without changing them in other forms and get a new complex number in trig form? For example: #rho_1[cos(alpha)+isin(alpha)]+rho_2[cos(beta)+isin(beta)]=?# Thanks!
  
• In 1939 England and France declared war on Germany as a reaction to the invasion of Poland. Two weeks after the German invasion the USSR invaded Poland from the east. Shouldn't they have declared war on USSR as well?