https://www.peaksat.com/lessons/successive-percent-changes2026-10-13T00:00:00.000Zhttps://www.peaksat.com/learning/videos/successive-percent-changes.jpgWhy a 20% Increase and 20% Decrease Do Not CancelA short original worked lesson showing why successive percentage changes use different bases, with a checked $100 example and a transfer problem.https://www.peaksat.com/learning/videos/successive-percent-changes.mp4522026-10-11T02:55:15.346Zno https://www.peaksat.com/lessons/quadratic-maximum-vertex2026-10-13T00:00:00.000Zhttps://www.peaksat.com/learning/videos/quadratic-maximum-vertex.jpgFind a Quadratic Maximum Without Confusing Time and HeightA short original worked lesson finding the vertex of h(t) = −2t² + 12t + 5 and verifying the maximum with completed-square form and the domain.https://www.peaksat.com/learning/videos/quadratic-maximum-vertex.mp4562026-10-11T02:55:21.811Zno https://www.peaksat.com/lessons/clause-boundaries-semicolon2026-10-14T00:28:06.866Zhttps://www.peaksat.com/learning/videos/clause-boundaries-semicolon.jpgChoose a Sentence Boundary by Testing Both ClausesAn original captioned Reading and Writing lesson contrasting two complete clauses with a dependent opener, with a fresh punctuation check.https://www.peaksat.com/learning/videos/clause-boundaries-semicolon.mp4642026-10-14T00:28:06.866Zno https://www.peaksat.com/lessons/transitions-and-evidence2026-10-14T00:28:15.681Zhttps://www.peaksat.com/learning/videos/transitions-and-evidence.jpgChoose a Transition from the Relationship Between IdeasAn original captioned Reading and Writing lesson choosing contrast and cause transitions while keeping conclusions within the evidence.https://www.peaksat.com/learning/videos/transitions-and-evidence.mp4712026-10-14T00:28:15.681Zno https://www.peaksat.com/lessons/desmos-system-intersection2026-10-14T00:27:05.919Zhttps://www.peaksat.com/learning/videos/desmos-system-intersection.jpgSolve a System in the SAT Testing Desmos CalculatorActual calculator captures show two entered equations, the intersection, a substitution check and a fresh transfer question.https://www.peaksat.com/learning/videos/desmos-system-intersection.mp4552026-10-14T00:27:05.919Zno https://www.peaksat.com/lessons/desmos-quadratic-maximum2026-10-14T00:27:29.470Zhttps://www.peaksat.com/learning/videos/desmos-quadratic-maximum.jpgFind a Quadratic Maximum in SAT Testing DesmosActual testing-calculator screens show a window adjustment, vertex coordinates and an exact completed-square check.https://www.peaksat.com/learning/videos/desmos-quadratic-maximum.mp4582026-10-14T00:27:29.470Zno https://www.peaksat.com/lessons/desmos-linear-regression2026-10-14T00:27:59.761Zhttps://www.peaksat.com/learning/videos/desmos-linear-regression.jpgUse Linear Regression in SAT Testing DesmosReal testing-calculator captures show data lists, the regression tilde, fitted parameters and an exact independent check.https://www.peaksat.com/learning/videos/desmos-linear-regression.mp4722026-10-14T00:27:59.761Zno