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maths

posted 211 days ago

maths

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Theo

A substance  decays by an expression 3 exponent 2y where y is in years. Find the number of years needed for the substance to decay to a size of 9 exponent 4.

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Winn

3^2y=9^4

3^2y=3^6

(since the bases are the same equate the powers)

2y/2=6/2

y=3 years

5 days

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