Answers created by David Chi

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• There were 110 books in two bookshelves. If we put half of the books from bookshelf B to bookshelf A, then there will be four times more books in bookshelf A, than there is now in bookshelf B. How many books were in the bookshelves in the beginning?
  
• How do I verify the following trigonometric identity? 1+sinx/cosx=cosx/1-sinx
  
• How do you identify the axis of symmetry and vertex of #f(x) = -x^2-2x-1#?
  
• How do you solve #m- ( 2m + 1) = 8- ( 3m + 3)#?
  
• Question #a8413
  
• Question #9c430
  
• How do you solve #-\frac { 2} { 3} = \frac { 5} { 3} v - \frac { 5} { 9}#?