| 138 | 137th LS(210531) Combinations of Transformation (PDF 14) | Jp Park  | 2021-06-01 | 6 |
| 139 | 138th LS(210602) Line Eqs (PDF 28) | Jp Park | 2021-06-03 | 2 |
| 140 | 139th LS(210603) System Eqs in 3 variables (PDF 35) | Jp Park | 2021-06-04 | 6 |
| 14 | 13th LS(200520) 7.5 Properties of Trapezoid(P399) | Jp Park | 2020-05-20 | 6 |
| 141 | 140th LS(210607) Ch2. Quadratic Eqs (PDF 47) | Jp Park | 2021-06-08 | 0 |
| 142 | 141th LS(210609) 2.2 Characteristic of Quadratic Functions .. | Jp Park | 2021-06-10 | 7 |
| 143 | 142th LS(210611) 2.4 Modeling with Quadratic Functions (PDF.. | Jp Park | 2021-06-12 | 2 |
| 144 | 143th LS(210614) Complex Number(PDF 109) | Jp Park | 2021-06-15 | 10 |
| 145 | 144th LS(210616) MGSE9-12.N.CN.7 Complex Conjugate | Jp Park | 2021-06-17 | 9 |
| 146 | 145th LS(210618) MGSE9-12.A.REI.4 Quadratic Eqs & Inequality | Jp Park | 2021-06-19 | 4 |
| 147 | 146th LS(210621) MGSE9-12.N.RN.1 Extend the Properties of ex.. | Jp Park | 2021-06-22 | 1 |
| 148 | 147th LS(210623) MGSE9-12.N.RN.2 Rewrite expressions involvi.. | Jp Park | 2021-06-24 | 1 |
| 149 | 148th LS(210625) 2-5KSA09 (PDF 48 #11) | Jp Park | 2021-06-25 | 4 |
| 150 | 149th LS(210625) MGSE9-12.N.RN.2 radicals and exponents 연습문.. | Jp Park | 2021-06-26 | 1 |
| 15 | 14th LS(200525) 8.2 Proving Triangle Similarity(P430) | Jp Park | 2020-05-25 | 4 |
| 151 | 150th LS(210628) MGSE9-12.A.APR.5 Binomial Expansion | Jp Park | 2021-06-29 | 2 |
| 152 | 151th LS(210630) MGSE9-12.A.APR.6 Rewrite rational expressi.. | Jp Park | 2021-07-01 | 1 |
| 153 | 152th LS(210701) 2-5KSA09 (PDF 55 #29) | Jp Park | 2021-07-02 | 1 |
| 154 | 153th LS(210702) MGSE9-12.F.BF.1 Relationship between two qu.. | Jp Park | 2021-07-03 | 4 |
| 155 | 154th LS(210705) MGSE9-12.F.BF.1C Compose Function | Jp Park | 2021-07-06 | 1 |
