SOLUTION: If a pyramid is made up of a stack of blocks in which each of the 10 layers in the stack has 10 fewer blocks in it than the layer under it, how many blocks are there in the pyramid

Question 420163: If a pyramid is made up of a stack of blocks in which each of the 10 layers in the stack has 10 fewer blocks in it than the layer under it, how many blocks are there in the pyramid if the top layer has 4 blocks?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
This is an arithmetic sequence with the following parameters:
n = 10 (the number of layers)
(the number of blocks in the topmost layer)
d = -10 (the next higher layer has 10 fewer blocks)
Now ==> ==> .
==> .
RELATED QUESTIONS
A pyramid of blocks has 26 blocks at the bottom row and 2 fewer blocks each successive... (answered by Boreal)

Carmen is playing with blocks. She arranges stacks of blocks so that each successive... (answered by Fombitz)

Carmen is playing with blocks. She arranges stacks of blocks so that each successive... (answered by Theo)

A display of blocks is arranged in a pyramid with five layers. The bottom layer has 36... (answered by jim_thompson5910)

a pyramid of empty cans has 30 blocks in the bottom row and one fewer can in each... (answered by Boreal)

A pyramid of blocks is built in layers. The bottom layer has 6 to the 2 or 36 blocks.... (answered by ikleyn)

RETAIL DISPLAYS You work in a grocery store and you are stacking apples in the shape of... (answered by richard1234)

If a stack of n layers of power poles contains four poles in the top layer and each layer (answered by Boreal)

Read the problem in the box below. See if you can figure out the most logical answer.... (answered by jim_thompson5910)