How do variables you model real-world situations? give an example of a model that uses variables and explain how it people make predictions.

River Cauvery in India is drying up.So, to make Cauvery alive again ,Trees are planted, for that fund is required by an Organisation who is working on this project.Now, total amount of fund required for planting trees is $x.Now, Thousand Business Person's has decided that we will participate in this fundraising Program and they will share Equal amount of Money.And each Business Person Donated $ y.

Solution:

 Here ,we have used two variables x, and y.

Where, x=Total Amount Required for Planting Trees

And, y=Amount Donated by each of thousand Business Person

    So, if you write this statement in terms of equation, it will be

  ⇒x-1000y=0

she will travel a distance in the range of 3 - 11 miles