A radioactive substance decays in a manner so that at time t = 50 days, 30% of the substance remains. What is the amount after
20 days, if the initial amount was 242.8 g?

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Ответ:

milkshakegrande101

30.06.2020

Mathematics

1.x}^{2} - 2x - 24

x²- 2x+1²-1²-24

(x-1)²-25

(x-1)²-5²

(x-1+5)(x-1-5)

(x+4)(x-6)

Step-by-step explanation:

{x}^{2} + 5x + 6

x²+3x+2x+6

x(x+3)+2(x+3)

(x+3)(x+2)

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A radioactive substance decays in a manner so that at time t = 50 days, 30% of the substance remains. What is the amount after 20 days, if the initial amount was 242.8 g?