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A mathematics educator and lead author of Precalculus 2e by Jay Abramson.^[ref]

Institutional profile: search.asu.edu/profile/230861

Online text: openstax.org/books/precalculus-2e/pages/10-1-the-ellipse

Section of Precalculus 2e by Jay Abramson. The citation panel names Jay Abramson as whole-book author and gives publication on 21 December 2021; the preface supplies no individual chapter allocation. No separately credited section author or revision date is established.

Cited passages: Writing Equations of Ellipses in Standard Form, Figure 2; Ellipse definition and Deriving the Equation of an Ellipse Centered at the Origin, Figure 5; Citation panel authors/title/publication date.

Online text: openstax.org/books/precalculus-2e/pages/10-4-rotation-of-axes

Section of Precalculus 2e by Jay Abramson. The citation panel names Jay Abramson as whole-book author and gives publication on 21 December 2021; the preface supplies no individual chapter allocation. No separately credited section author or revision date is established.

Cited passages: Identifying Conics without Rotating Axes; Using the Discriminant to Identify a Conic.

Section of Precalculus 2e by Jay Abramson. The citation panel credits Jay Abramson as whole-book author; the preface gives no individual chapter allocation. OpenStax publishes and hosts the book. The parent record establishes whole-book publication on 21 December 2021; no separate section revision date is asserted.

Online text: openstax.org/books/precalculus-2e/pages/11-2-arithmetic-sequences

Cited passages: Arithmetic Sequence definition; Recursive Formula for an Arithmetic Sequence; Explicit Formula for an Arithmetic Sequence.