a certain sybol or number , Hannah aged 9
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XS = 10+1/2
XS in Roman Numerals might be 10.5 or 10 1/2. Ten and a half.
In Roman numerals S = 1/2 or 0.5 and XS would mean 10.5
Oh, dude, totally! So, a rectangular array is just a fancy way of saying a grid, right? If you want 10 Xs with 3 rows, you'd have 3 rows of Xs with 3 Xs in each row and then 1 lonely X in the last row. Voila! You've got yourself a rectangular array of 10 Xs with 3 rows. Easy peasy, lemon squeezy!
Normally, alpha is used to represent an angle. Just like "x" is used to represent an unknown number or angle, alpha, theta, beta are used to represent unkown angles.