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A person might choose a folding kitchen step stool instead of one that doesn't fold because it takes up less space in the kitchen and they're less likely to trip over it and spill something.
it isnt It is not stronger. True, a 3-leg will not wobble because 3 points define a plane. However, a 3-legged table will tip over more easily than a 4-legged table. I suspect some science guru has done the physics on this and can prove what I say.
so its easier to get over the bar. think about it. when they curve their backs, its easier to get their bodies over the bar. if they just go straight out, their bodies wont make it.
It could have been either but it must have been easier to put the y-coordinate on top.
It is advantageous to use charts because it makes it easier to compare two variables over a period of time. It also becomes easier to explain or to present certain ideas.