Zoey is collecting Pokémon cards. She already has 50 cards and she buys 10 every week. How many weeks will it take her to collec
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ANSWER
The pattern is geometric.
EXPLANATION
The given pattern is:
7, -21, 63, -189,..
We can see from the pattern that,
Since there is a common ratio of -3, the pattern is geometric.
The first term of this pattern is
The nth term of the pattern is given by the formula:
To find the 23rd term, we put, n=23, the first term and the constant ratio.