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Answer:
what is direct variation?
=Direct variation is a type of proportionality wherein one quantity directly varies with respect to a change in another quantity.
-what is inverse variation?
=Inverse variation describes another kind of relationship. For two quantities with inverse variation, as one quantity increases, the other quantity decreases.
-what is joint variation?
=Joint variation describes a situation where one variable depends on two (or more) other variables, and varies directly as each of them when the others are held constant.
-what is combined variation?
=Combined variation describes a situation where a variable depends on two (or more) other variables, and varies directly with some of them and varies inversely with others (when the rest of the variables are held constant).