FOR THOSE GONE TO ENVIRONTHON

Videos to help you:


What r and r^2 mean:   JUST R (correlation coefficient)
                                      LONG BUT INTERESTING ON R^2  (coefficient of determination)
Using DESMOS:     MOSTLY LINEAR EXAMPLES  and  QUADRATIC EXAMPLE

The link for the key is below.  Please be aware of a couple of things:
1)  In the last section, every problem that says "real" should be replaced with "rational."  Also:  2 imaginary solutions is equivalent to no solution
2)  On the real test tomorrow, there will be some irrational solutions in that last section.
3)  In the problems where you clear fractions, expect at least one problem where there will be two answers (solving a 2nd degree equation).

KEY