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Cake day: June 9th, 2023

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  • Vagabond@kbin.socialtoAsklemmy@lemmy.mlWhats your such opinion
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    11 months ago

    I see what you’re getting at but the issue isn’t really the assumed multiplication symbol and it’s priority. It’s the fact that when there is implicit multiplication present in an algebraic expression, and really best practice for any math above algebra, you should never use the ‘÷’ symbol. You need to represent the division as a numerator and denominator which gets rid of any ambiguity since the problem will explicitly show whether (2+2) is modifying the numerator or denominator. Honestly after 7th grade I can’t say I ever saw a ‘÷’ being used and I guess this is why.

    That said, I’ll die on a hill that this is 16.


  • Ah sorry just realized what you were saying. I’ve never been taught that. Maybe it’s just a difference in teaching styles, but it shouldn’t be since it can actually change the outcome. The way I was always taught was if you see a number butted up against an expression in parentheses you assume there is a multiplication symbol there.

    So you were taught that 2(2+2) == (2(2+2))
    I was taught 2(2+2)==2*(2+2)

    Interesting difference though because again, assuming invisible parentheses can really change up how a problem is done.

    Edit: looks like theshatterstone54’s comment assumed a multiplication symbol as well.


  • Vagabond@kbin.socialtoAsklemmy@lemmy.mlWhats your such opinion
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    11 months ago

    Not quite. It’s true you resolve what’s inside the parentheses first, giving you. 8÷2(4) or 8÷2x4.
    Now this is what gets most people. Even though Multiplication technically comes before Division the Acronym PEMDAS, that’s really just to make it sound correct phonetically. Really they have equal priority in the order of operations and the appropriate way to resolve the problem is to work from left to right solving each multiplication or division sign as you encounter them. Giving you 16. Same for addition and subtraction.

    So basically the true order of operations is:

    1. Work left to right solving anything inside parentheses
    2. Work left to right solving any exponentials
    3. Work left to right solving any multiplication or division
    4. Work left to right solving any addition or subtraction

    Source: Mechanical Engineering degree so an unfortunate amount of my life spent in math and physics classes.







  • Here’s something you need to consider though. We need a well trained Navy and Coast Guard. It’s kind of a necessity that those guys know how to perform water rescues and can perform them well. And it’s for that reason that they actually use events like this for training when they can. Obviously this is extraordinarily rare, so typically they stage trainings for deep water recoveries instead. This is more useful, more real training than the latter option. Likely no one is going to need to pay for the recovery because it’s built into the Navy and Coast Guards budgets set aside for training that would have otherwise paid for a staged recovery. Only this time, they were able to use an actual disaster as a training opportunity. They likely knew, or we’re at least confident that the sub imploded on that Sunday but still spent 4 days on the recovery effort partly to train and partly to get additional evidence to confirm their suspicions.