Answers edited by Zack M.

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• How do you simplify #(18x)/(x^2-5x-36) + (2x)/(x+4)#?
  
• Question #21ce0
  
• How does the life cycle of a star relate to the mass of the elements that it produces?
  
• What lies beyond the universe?
  
• A quasar consumes 1 solar mass of material per year, converting 15 percent of it directly into energy. What is the quasar's luminosity, in solar units?
  
• What is the Big Bang Theory and does it relate to how the universe came into existence?
  
• Question #b7ecc
  
• Question #5bc78
  
• How do you factor #25x^2-9y^2z^2#?
  
• What is the equation of the line that passes through the following points?: (2,3),(1,5),
  
• What are the four fundamental forces in order of strength?
  
• What are the relative positions of the sun, Earth, and moon at the times of lunar and solar eclipses, as well as new, first-quarter, full, and last-quarter phases of the moon?
  
• How do you differentiate #f(x)=1/cossqrt(1/x)# using the chain rule?