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April 27, 2015

Homework Help: math, algebra

Posted by Jasmine20 on Thursday, December 7, 2006 at 1:37am.

How is 28 a perfect number? Can someone explain this to me.

all i understand that all perfect numbers end in 6 and 8. But how and why is 28 a perfect number.

dimes are packaged 50 in a roll. quarters come 40 in a roll.susan b anthony dollars come in rolls of 25. how many rolls of each do you need to have an equal number of each coin


fulij
your answer has nothing to do towards what i'm asking

fulij please use the Post a New Question choice at the top of the page

28 is a perfect number because its proper divisors are 1, 2, 4, 7, and 14.
So 1 + 2 + 4 + 7 + 14 = 28.

Oh, and for a number to be a perfect number, it's proper divisors must add up to the original number. Just like I showed you about with 28. Another example is the number six. It's proper divisors are 1, 2, and 3. So 1 + 2 + 3 = 6.

Thank you I will study of from what you explained to me.

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