PLEASE HELP!!!!!
Meredith has a set of ninety 1-inch tiles. If she starts with one tile, then surrounds it with a ring of tiles to create a larger square, how many surrounding rings can she make before she runs out of tiles?

Question

PLEASE HELP!!!!!
 Meredith has a set of ninety 1-inch tiles. If she starts with one tile, then surrounds it with a ring of tiles to create a larger square, how many surrounding rings can she make before she runs out of tiles?

hartnn · Answer

how many tiles will be used in first ring ?

hartnn · Answer

can u imagine and answer that ?

hartnn · Answer

the pattern is 3^2-1^2, 5^2 -3^2 ,....
which is 8,16,24,32.....
multiples of 8
see whether u get this ?

hartnn · Answer

so when will the sum be less than 90.... ?

anonymous · Answer

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you can draw a picture then try to find a pattern to how many tiles you need as you add a ring around it

so starting from the first tile
1, 4, 8 ...