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In that case, one quantity (the quantity that depends on the other) is said to be a function of the other quantity.
The variable "I" in algebra can represent any unknown quantity or value. It is commonly used to represent interest in mathematical equations related to finance or economics. However, "I" can refer to any unknown in an equation and its meaning depends on the specific context in which it is used.
It depends on the direction of the relationship. Consider y = x2 where x is a real number. The relationship from x to y is a function but the one in the opposite direction (x = sqrt(y) is not a function because it is a one-to-many mapping.
It depends. My 8th grader takes Algebra 1. I think it counts as 9th grade math.
It depends what type of question you are trying to answer.