This is a big question. I you enter 'relational algebra' in a search engine, you will find many sites which go over this. Wikipedia usually takes a very high level abstract approach. The link below seems fairly easy to understand.
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The main operation on the cubic root is finding the value of the cubic root of a number. This is commonly represented by using the symbol ∛, such as ∛x. Other related operations include estimating the value of the cubic root, solving equations involving cubic roots, and using properties of cubic roots in mathematical calculations.
Yes ear muffs do come in different sizes. Ear muffs come in a small size suitable for children's ears and a larger size suitable for adult ears. They also come in a variety of styles and colors.
The adverb is suitably (in a suitable manner).
Matchboxes come in lots of different sizes - particularly kitchen boxes. The volume is its length * width * height, in suitable units.
Punctual