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Answer:
There would be 94 tiles.
Step-by-step explanation:
The number of tiles is given by the following equation:

In which p is the current position.
How many tiles would there be in position 22?
This is n when
. So

There would be 94 tiles.
1. Distribute the -2x with the (x+3)
2.Multiply (x+1) and (x-2) which is (x2- x -2)
So far it should look like (-2x^2 -6x) - (x^2-x-2)
3. Distribute out the negative
Should look like this -2x^2 -6x - x^2+x+2
4. Lastly combine like terms
Your result should be:
-3x^2 - 5x + 2
Hope this helps!