| 41 | 41th LS(200929) Ch7.2 Graphing Rational function(P368) | Jp Park  | 2020-09-30 | 2 |
| 42 | 42th LS(201006) Ch7.5 Solving Rational Eqs(P394) | Jp Park | 2020-10-07 | 12 |
| 43 | 43th LS(201020) Ch8.2 Atithmetic Sequence(P424) | Jp Park | 2020-10-21 | 1 |
| 44 | 44th LS(201027) Ch8.4 Finding Sums of Infinite Geometric Ser.. | Jp Park | 2020-10-28 | 1 |
| 45 | 45th LS(201103) Ch8.5 Using Recursive Rules(P448) | Jp Park | 2020-11-04 | 2 |
| 46 | 46th LS(201110) Ch9.2 angles and radian(P476) | Jp Park | 2020-11-11 | 2 |
| 47 | 47th LS(201117) Ch9.4 Grphing sin and cosine function(P494) | Jp Park | 2020-11-18 | 2 |
| 48 | 48th LS(201201) Ch9.6 Modeling with Trigonometry(P512) | Jp Park | 2020-12-02 | 5 |
| 49 | 49th LS(201209) Ch9.8 Using sum and difference(P524) | Jp Park | 2020-12-09 | 3 |
| 50 | 50th LS(201215) Ch10.2 Independent & dependent Events(P552) | Jp Park | 2020-12-16 | 1 |
| 51 | 51th LS(201222) Ch10.5 Permutation and Combination(P574) | Jp Park | 2020-12-23 | 1 |
| 52 | 52th LS(210105) Ch11.1 Using Normal Distribution(P598) | Jp Park | 2021-01-06 | 1 |
| 53 | 53th LS(210112) Ch11.1 Using Normal Distribution(P602) | Jp Park | 2021-01-13 | 1 |
| 54 | 54th LS(210119) Ch11 끝까지 | Jp Park | 2021-01-20 | 1 |
| 55 | 55th LS(210126) Ch1.4 Functions(PDF P53) | Jp Park | 2021-01-27 | 1 |
| 56 | 56th LS(210202) Ch1.9 Inverse Functions(PDF P96) | Jp Park | 2021-02-03 | 1 |
| 57 | 57th LS(210209) Ch2.2 Polynomial Functions of Higher Degree(.. | Jp Park | 2021-02-10 | 1 |
| 58 | 58th LS(210218) Ch2.5 Zero of Polynomial Functions(PDF P171.. | Jp Park | 2021-02-19 | 2 |
| 59 | 59th LS(210223) Ch2.7 Rational Functions(PDF P200) | Jp Park | 2021-02-24 | 5 |
| 60 | 60th LS(210302) Ch3 Exponetial and Log Functions(PDF P256) | Jp Park | 2021-03-03 | 11 |
