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mitchelsewbaran
Group Title
A child is creating a pyramid with building blocks. The top three levels include 5 blocks, 12 blocks, and 19 blocks. How many blocks would be needed for a pyramid 25 levels tall? Use complete sentences to explain how a sum of an arithmetic series was applied.
 2 years ago
 2 years ago
mitchelsewbaran Group Title
A child is creating a pyramid with building blocks. The top three levels include 5 blocks, 12 blocks, and 19 blocks. How many blocks would be needed for a pyramid 25 levels tall? Use complete sentences to explain how a sum of an arithmetic series was applied.
 2 years ago
 2 years ago

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tcarroll010 Group TitleBest ResponseYou've already chosen the best response.1
[5 + (7*0)] + [5 + (7*1)] + [5 + (7*2)] + ... + [5 + (7*24)] = (25)(5) + 7(1 + 2 + 3 + ... + 24) = 125 + 7[(24)(25)]/2
 2 years ago

tcarroll010 Group TitleBest ResponseYou've already chosen the best response.1
That's a lot of blocks for one child! :)
 2 years ago

tcarroll010 Group TitleBest ResponseYou've already chosen the best response.1
The key is that the sum of 1 + 2 + 3 + ... + (n1) + n = n(n+1)/2
 2 years ago

tcarroll010 Group TitleBest ResponseYou've already chosen the best response.1
Making sense? If not, ask any question you like.
 2 years ago
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