Questions asked by Izzy H.

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• Ethene undergoes incomplete combustion to form carbon dioxide, carbon monoxide and water vapour. If the ratio of carbon dioxide to carbon monoxide formed is 9:1 when x cm^3 of ethene is burnt, what is the volume of oxygen gas consumed in the reaction?
  
• Is the polar function #5-4 sin theta# symmetric with respect to the y axis?
  
• Why is #r=3cos2theta# not symmetric over #theta=pi/2#?
  
• Is this correct?
  
• How does #(costheta_1costheta_2-sintheta_1sintheta_2)+i(costheta_1sintheta_2+sintheta_1costheta_2)# become: #[cos(theta_1+theta_2)+isin(theta_1+theta_2)]#?
  
• How do I represent #z=-3+3sqrt3 i# in polar form?
  
• How to fi the final form of the augmented matrix when solving for the inverse of this system of equations? #2x+3y=4#nd #4x+5y=5#
  
• How to find the final form of augmented matrix when solving for the inverse of this system of equations? #2x+3y=4# #4x+5y=5#
  
• Why is this wrong when I solve for finding the inverse of the matrix by using gauss jordan elimination?
  
• What is the total volume of gas produced from the decomposition of #100cm^3# of #0.2 mol#/#dm^3# hydrogen peroxide(#H_2 O_2#)?
  
• Help! I'm not good in circuits! Can you please explain the answer to me?
  
• Looking for answers for a)iv), a)v) and c)... Is my brain not working or are the answers in my book wrong? An explained answer is much appreciated!
  
• I was taught that if the adjacent length was longer than the opposite length of a known angle, there would be an ambiguous case of the sine rule. So why does d) and f) not have 2 different answers?
  
• What is the upper and lower bound of #c/a - b/d#?
  
• Why isn't this triangle an ambiguous case? (where there can be 2 possible triangles from the same set of lengths and an angle)
  
• In the shoots of plants, do auxins cause curvature and elongation of the cells or allow them to grow faster? Or is it both?