A community for students.
Here's the question you clicked on:
 0 viewing
 2 years ago
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
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.

This Question is Closed

tcarroll010
 2 years ago
Best 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

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

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

tcarroll010
 2 years ago
Best ResponseYou've already chosen the best response.1Making sense? If not, ask any question you like.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.