Melody

1)      Solving quadratic inequalities                              Thanks CPhill

2)      Finding the constant of variation                         Melody

3)      Rationalizing the denominator                            Melody

4)      Solving Trig equations                                        Thanks CPhill

5)      Function Notation    FTJ                                    Thanks CPhill

6)      A good volume question                                    Thanks Alan

7)      Functions and their graphs                                 Thanks CPhill, Alan and Melody

8)      Scientific notation and significant figures   FTJ     Thanks anon and Melody

9)      Counting again.  I must have tooo much time one my hands     LOL

10)    Trig identity proof                                              Not answered.             

                    ♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

https://www.youtube.com/watch?v=hJRXKq2GEo8

3C2 means how many combinations of 2  can you get from 3 objects   I'll call them  A,B,C

Well you can get  AB, AC, or BC  so    3C2=3

3P2 means how many permutations of 2  can you get from the 3 objects 

Well with permutations order counts so you can have

AB or BA, AC or CA, BC or CB      SO     3P2=6

nCr means how many combinations of r objects can you take from n objects.

nPr means how many permutations of r objects can you take from n objects.     

https://www.youtube.com/watch?v=O8ezDEk3qCg