*Two trigonometric sums are viewed pictorially.*

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*An example is given where Newton's method converges but the limit does not satisfy the equation.*

*The author investigates the graph of a quartic polynomial with inflection points and finds many regularities, some involving the Golden Ratio.*

*The author states a "Master Theorem" from which, exploiting concavity, he deduces several classical inequalities.*

*The creation of 'extriangles' based on a given triangle is iterated, giving rise to four quadrilaterals each with area five times the area of the original triangle.*

*This paper offers a visual illustration of the fact that every octagonal number is the difference of two squares.*

The author offers two examples that illustrate important central ideas in introductory linear algebra (independent or dependent vectors; invertible or singular matrices) which may aid students in...