Q = {a,b,c}
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There are no "following" data!
Write the following as an algebraic expression using x as the variable: The sum of a number and -8
Don't write "the following" if you don't provide a list.
125 - x.
symbols
Search in a periodic table the chemical symbols of all chemical elements.
The chemical symbols of gold, copper, potassium, silver, platinum, and Iron are Au, Cu, K, Ag, Pt, and Fe respectively.
Write the following as an algebraic expression using x as the variable: The sum of a number and -8
The rules for naming chemical elements and for chemical symbols are established by IUPAC; see this link.
You've done a fine job of it in your question. If you want to write it without those mathematical-looking number symbols, you could write "six hundred thirteen".
Fourteen and two hundred fifty-one thousandths.
Because it is more simple to write one or two letters than a word and also these symbols are valid in all languages.
because it would suck to have to write out their full names everytime
Scientist combine the symbols for different elements when they write chemical formulas.
The chemists' shorthand for elements is called chemical symbols. For example, instead of writing out 'selenium,' it can be quickly written as 'Se.'
square root of 0.2^-2=5