If you have more context (country, school level, approximate year), I can refine the search further.

After an extensive search of academic repositories, university syllabi, and digital libraries (including platforms like Google Books, WorldCat, Scielo, Redalyc, and ResearchGate), there is no record of a mathematics or algebra work authored by someone named “Mary Rojas” with that title.

However, the search phrase includes the word álgebra and seems to point toward a possible —likely from a study guide, an informal worksheet collection, or a regional publication from Latin America (possibly Mexico, Colombia, or Venezuela), where expressions like “me las vas a pagar” (threatening or promising future reckoning) are common in everyday speech but not in formal academic literature. Possible Interpretation of the Search The user’s intent may actually be to find algebra exercises, problem sets, or a teacher’s supplementary material associated with a strict or memorable instructor nicknamed “Mary Rojas.” In some Latin American high schools or preparatory courses, teachers create informal booklets or PDFs for students, and students nickname them with dramatic titles.

It is important to clarify that is not a recognized or standard title for any known textbook, academic guide, or published PDF in the field of algebra.