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In pharmacy, a "T" with a dot over it denotes "one tablet." Two "Ts"l with 2 dots on top represent 2 tablets.
It is unknown what the variable T is, but it is a mathematical notation that a dot over a variable stands for the derivative with respect to time of that variable. So T with a dot over it = derivative of T with respect to time = dT/dt. T in physics typically stands for the period/ 1/frequency -- The symbol you describe written on a medical prescription means one. Two dots over a bar with two down strokes (looks like a little symbol for pi) means two, etc.
The number is using European number rules, and is 78,498,802 in US convention. This would be written "seventy-eight million, four hundred ninety-eight thousand, eight hundred (and) two." As a numerical URL (domain name), it would never be written out, but spoken as "seventy-eight dot four ninety-eight dot eight-oh-two." Or more rarely as "seven eight dot four nine eight dot eight oh two".
Hold down the Alt key and type 139
The key to using the elimination method is to find variable terms in two equations that have unequal coefficients