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It is a cone.
An antecedent variable is one that comes before the dependent variable. They stand by themselves, thus are independent.
In the US a trillion comes after a billion. In other countries, a billion is called a milliard and a billion would be equivalent to a trillion in US terms.
Math is short for Mathematics. It comes from an Ancient Greek root, meaning "to learn."
Cycles per second (CPS) unless you are dealing with electrical, electro-magnetic, and electronic issues, in which case the 'vibrations' are measured in Hertz (Hz). The word is capitalized because its name comes from a person's name. The unit, "Hertz" is often mistakenly used when CPS is the correct unit.