-- a person walking
-- an ant running
-- a car driving
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It is a matter of scale.
To model 1.04 on a grid, you can represent it as a square with side lengths of 1 and 0.04 units. This can be visualized as a square divided into 100 smaller squares, with 4 of those smaller squares shaded to represent the 0.04 part. Each smaller square would represent 0.01. This grid model can help demonstrate the concept of decimals and their relationship to whole numbers.
If a linear model accurately reflects the measured data, then the linear model makes it easy to predict what outcomes will occur given any input within the range for which the model is valid. I chose the word valid, because many physical occurences may only be linear within a certain range. Consider applying force to stretch a spring. Within a certain distance, the spring will move a linear distance proportional to the force applied. Outside that range, the relationship is no longer linear, so we restrict our model to the range where it does work.
A mathematical model is the representation of a relationship or state or phenomenon in a mathematical form using control variables.
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