Mark is building a pyramid out of blocks. The top of his pyramid has 1 block, the second layer has 4 blocks, the third layer has 9 blocks, the fourth layer has 16 blocks, and the fifth layer has 25 blocks. If Mark decided to add a sixth layer to his pyramid, how many blocks would that layer have?

Respuesta :

Answer:

36

Step-by-step explanation:

The difference between the first and second layer is 3, then 5, then 7, then 9, so you can deduce the next one will be 11.

25+11=36

Answer:

The number of blocks in sixth layer would be 36.

Step-by-step explanation:

The number of blocks from the top layer to the fifth layer are:  [tex]1, 4, 9, 16, 25[/tex]

The difference between the consecutive numbers are....

[tex]4-1=3\\ \\ 9-4=5\\ \\ 16-9=7\\ \\ 25-16=9[/tex]

These differences make an arithmetic sequence as [tex]3, 5, 7, 9,....[/tex] with common difference of [tex]2[/tex].

That means, the next term in this arithmetic sequence will be:  [tex]9+2=11[/tex]

So, the sixth layer will have  [tex]11[/tex]  more blocks than the fifth layer.

Thus, the number of blocks in sixth layer [tex]= 25+11= 36[/tex]