Answers edited by Jonny

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• `lim_(t->0)(1-sqrt(t/(t+1)))/(2-sqrt((4t+1)/(t+2))`?
  
• Your profit for mowing lawns this week is $24. You are paid $8 per hour and you paid $40 for gas for the lawn mower. How many hours did you work this week?
  
• How do you integrate `16/((x-1)^2(x+1)^3)` using partial fractions?
  
• How to integrate `int 2^lnx/xdx` ?