I need hardly explain where you encounter circles.Ellipses are encountered when you cut a cylindrical object (e.g., a sausage) at an angle.
Parabolas are the approximate paths taken by objects thrown into the air (when air resistance is insignificant).
Hyperbolas: I may be wrong, but it would seem that these are less common in real life.
ALL of the conic sections can be seen when you shine a flashlight onto a level floor (or some other plane), since the light cone is, precisely, a cone.
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To find the wheels on a bicycle. wheels of a car, tire
it means when you have a real life problem that is relate to math.
they are no uses
There are no 'equations' on a number line. There are only numbers, such as 1, 2, 3...and so on. And they relate to life because you use them in counting. And you use that to count money, people, fingers, etc.
Look and see what a good cook-book has to say about cooking times in Denver.