An artist is arranging tiles in rows to decorate a wall each new row has 2 fewer tiles than the row below it if the first row has 23tiles how many tiles will be in the seventh row

11

Step-by-step explanation:  

We have been given that tiles in each new row is 2 less than the row below it and the first roe has 23 tiles.

We can see that tiles in rows represents a arithmetic sequence. So we will use arithmetic sequence formula to find the number of tiles in 7th row.

, where is nth term of sequence, is first term of sequence and d is the common difference between consecutive terms.

Let us substitute our given values in above mentioned formula to find the 7th term of our arithmetic sequence.

Therefore, there will be 11 tiles in 7th row.

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step-by-step explanation:

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