A variable.
Different fractions are equal to different values.
The gradient of a quantity is the greatest rate at which it changes as you move in different directions from where you are now. If the quantity has a negative gradient, that means that the quantity decreases in that direction. A great example of a negative gradient is the elevation of the land at a point on a road that has a hill on one side and a cliff on the other side. The greatest rate at which the elevation changes is in the direction off the edge of the cliff, and it's negative in that direction.
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Acceleration
They comprise a set of values for some variable x.
A variable.
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You're a variable.
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Integer variables
It could be the definition of equivalent ratios.
Quantity Select
They take the place of an unknown quantity. They can change values, thus they are called variables, their quantity varies.
A table which contains values for the price of a good and the quantity that would be supplied at that price. A market demand schedule is a table that lists the quantity of a good all consumers in a market will buy at every different price.
The answer will depend on what quantity is being measured by c.
Everyone will have different senses of values and traditions.
measured properties that have different values at different time are