1. Using a graphical method, find how close x must be to 1 to ensure that x² + 3 is within 0.1 of 4.
2. Restate the question in problem 1 using compound inequalities. Solve the appropriate inequalities to answer the question.
3. Use graphical and numerical methods to estimate the given limits.

   1. 
   2. (use radian mode)
   3. 
   4. 

Click here to check your answers.