This is a variation of the "Why do we have to know this?" debate that has plagued teachers and students as long as there have been teachers and students. The nasty truth is that there are a great many things that you encounter that will turn out to have little or no practical effect on your life. I find joy in problem solving, but you may not. Finding least common multiple answers sharpens your powers of deductive reasoning and that may turn out to be a useful tool or you. At the very least, you may one day have children who need help with their math homework.
I don't think it does...
what is the least common multiple of 6, 14, and 7
Adding or subtracting fractions requires the use of a common multiple. It is rare that the LEAST common multiple is required - it is useful to keep the numbers small and manageable.
In a non-academic, practical setting the LCM is used when unlike fractions are added or subtracted, like when a carpenter has to add measurements of eights and sixteenths.
to help us with are life in math
Life forms are indeed related. The reason is due to all life forms starting out with a single, unicellular common ancestor, with that common creature radiating into multiple forms to take advantage of its environment.
Those are commonly used for working with fractions. You need the least common multiple to find a common denominator, for adding or subtracting fractions. And after doing some manipulations with fractions, you need the greatest common factor to simplify the fractions.Now, whether this is sufficiently "real-life" for you, is another issue. Depending on the career you choose, you many need to work with fractions on a daily basis, or you may hardly ever need them.
You have to be calm and think with a light head. This helps to get the most optimistic solution.
You can help a rat have a longer life if you keep it healthy (water food exercise) and keep the rat in a clean cage (claening at least once a week)
give at least 3 life situations where solutions can be used afficiently?
The whole idea of algebra (at least, to a great extent) is to help solving real-life problems.
Photosynthesis evolved multiple times in the history of life on Earth. It is believed to have evolved at least two separate times, leading to different types of photosynthetic organisms.