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Mathematics, 04.12.2020 22:30 yariiixox

Y=-0.72x^4+3.2x^3+25.9 describes the billions of flu virus particles in a persons body x days after being infected. Find the number of virus particles, in billions, after 4 days. someone pls help me quickly

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Y=-0.72x^4+3.2x^3+25.9 describes the billions of flu virus particles in a persons body x days after...
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