This task is not about computing the final price of the shirt but about using the structure in the computation to make a general argument.
This task illustrates A-SSE.1a because it requires students to identify expressions as sums or products and interpret each summand or factor.
Though this website focuses on providing tours to Egypt, it offers an extensive list of words in the Egyptian dialect in both Arabic script and in transliteration. The word list includes the kinds of words you might need to know when traveling, such as "Go straight please" and "I need room service." Each word is transliterated and accompanied by an audio file. There is also an article about history of the Arabic language and the Egyptian dialect. Photo galleries on the site could be used as part of classroom instruction.
The purpose of this task is to emphasize the adjective "geometric" in the "geometric" series, namely, that the algebraic notion of a common ratio between terms corresponds to the geometric notion of a repeated similarity transformation.
These Trigonometry lecture videos coterminal angles, trig functions, quadrantal angles, special acute angles, co-functions, finding theta, reference angles, trig functions, radian measure, arc length, area of a sector, graphing sine and cosine using t-table, amplitude and frequency, phase shift for sine and consine, vertical shift, tangent curve, cotangent transformations, evaluating trig identities, trig expressions, sum and difference for cosine, double and half angle identities, inverse, principal values, solving difficult trig equations, law of cosines, area of a triangle, and vectors and bearing.
This site provides a description of Arabic aimed at a younger audience which includes the language's history, its famous authors, where it's spoken, common phrases and traditional expressions. The text emphasizes general information over language instruction.