Question 1101905
y=ab^x
400,000=ab^0 at day 0, and a=400,000
1200000=400000*b^3
b^3=3
b=3^(1/3)
at 8 days, y=400000*3^(1/3)^8=400000*3^(8/3)=7,488,302 rounded to nearest one.
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P=Poe^rt
400000=400000e^r(0);
1200000=400000e^3r
e^3r=3
ln both sides and 3r=ln 3
r=ln3/3
at 8 days
y=400000*e^8ln 3/3=7488302