Five examples:
1. Find the equation of the sphere centered at P (3, −1, 2) and containing the point Q(4, 6, −2).
2. Write the sphere x^2 - 4x + y^2 + z^2 + 10z = 20 in standard form. What is the radius ρ?
3. Graph the equation z=3−y in R3.
4. Graph the equation y = x^2 in R3.
5. Identify and graph 9x^2 + 4z^2 − 16z = 20 in R3.
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