We are given the first term and the common ratio, this means they belong to a geometric series.
For the given series:

Each term of the geometric series is obtained by multiplying the previous term by common ratio.
So the next terms will be:
-4.5, -6.75, -10.125, -15.1875, -22.78125
The general formula for the G.P would be:

On plotting the series, the result will be like this:
when you subtract numbers with three digits its almost exactly the same as regular subtracting but with decimals.
Answer:
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If you're asking about how many are in the school, the answer is 2000
Answer:
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