exam Maths Puzzle Numerical Ability

Can some one help me solve this problem?
Suppose instead that the town experiences growth that can be modeled by the following:
P=1000 squareroot t+ P, WHERE T IS THE NUMBER OF

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Good evening ma'am or sir will you please help on how to solve this problem involving expressions with exponents? Thank you very much.

2). One mole of water has a mass of 18 g a A sum $2300 is invested, part of it at 10% interest and the reaminder at 12%. If the interest earned by the 12% investment is $100 more than the intrest earned by the 10% investment, find the amount invested at each rate?

Thanks!