Mathematics: Suppose a countrys population in 1980 is 210 million. in 1990 it was 225 million using the a= 210 million if t=0 in 1980 find the value of t in 1990

x = 3/8Step-by-step explanation:Equation:multiply both sides by 5/2 the reciprocal of 2/5since 5/2 is the reciprocal of 2/5 they cancel outx = 15/40x = 3/8...

Suppose a countrys population in 1980 is 210 - id19802102717156, MoneyMike42

Ответ:

isaaccott013

04.01.2022

Mathematics

P=Ae^kt
225 = 210 * e^(k*(1990-1980)
225/210=e^10k
ln(225/210)=10k
k=ln(225/210)/10=0.0069

P = 210*e^(0.0069t) for 2000 ===> t = 2000-1980=20

P = 210*e^(0.0069*20)

P=241.0749=241

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Ответ:

fr996060

19.01.2023

Mathematics

x = 3/8

Step-by-step explanation:

Equation:

$\frac{2}{5} x = \frac{3}{20}$

multiply both sides by 5/2 the reciprocal of 2/5

$\frac{5}{2} * \frac{2}{5} x = \frac{3}{20} * \frac{5}{2}$

since 5/2 is the reciprocal of 2/5 they cancel out

x = 15/40

x = 3/8

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Suppose a countrys population in 1980 is 210 million. in 1990 it was 225 million using the a= 210 million if t=0 in 1980 find the value of t in 1990

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