Why did I just to be good at math but now I don't understand any of it my knowledge just flew away, can someone please explain how this happens/what causes this. Thanks :)

As  you get older your brain develops as you do so when you’re taught math your brain is developing a slightly slower pace than it should be for example if you have a teacher who doesn’t really teach a lot it’s really going to slow down the process of learning

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your answer is: c. 196 7/8 in^3.

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c) the x-coordinate of the center of the circle increases by 3