1. What does (sqr x) do?
2. What is the value of (my-sqrt 7) when epsilon = 0.1?
3. Scheme has a built in function (sqrt x). What is the value of (sqrt 7)?
4. Which is more accurate mysqrt or sqrt? Assume epsilon = 0.1 for mysqrt?
5. Find the largest value of epsilon such that my-sqrt will be more accurate
than sqrt.