maths
posted 403 days ago
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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.
268 days
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
197 days
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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.
268 days