Friday

October 31, 2014

October 31, 2014

Posted by **Carly** on Friday, September 14, 2012 at 1:38am.

- Math -
**Reiny**, Friday, September 14, 2012 at 8:18amThe top layer has 1 block

the 2nd layer from the top has 4 blocks

the 3rd layer from the top has 9 blocks

the 4th has 16 blocks

the 5th has 25 blocks, and

the 6th has s36 blocks

So we have 1+4+9+16+25+36

= 91

btw, there is a formula for the sum of squares of the first n numbers

sumofsquares(n) = n(n+1)2n+1)/6

sumofsquares(6) = 6(7)(13)/6 = 91

**Answer this Question**

**Related Questions**

physics - A block of mass 4.0 kg is put on top of a block of mass M = 6.0 kg. To...

physics - Two blocks, one 5.0 Kg and the other 2.0 Kg are suspended from a ...

physics - A 4.0 kg block is put on top of a 5.0 kg block. To cause the top block...

algebra2 - you are creating a window display at a toy store using wooden blocks...

Physics - Two blocks are stacked one on top of the other. The coefficient of ...

Physics - A block with mass M = 5.00 kg rests on a frictionless table and is ...

Physics - A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The ...

physics - Two blocks are connected by a string over a frictionless, massless ...

Physics - A block of mass m1 = 4.1 kg rests on a frictionless horizontal surface...

math - a jar contains 27 blue blocks 18 red blocks 12 orange blocks and 43 green...