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Chapter 2: Q. 10 (page 93)

Population From 1990 to 2000, the population of Cresco, Iowa, increased by 236. The population in 2000 was 3905. Use an equation to find the population in 1990.

Short Answer

Expert verified

Population in year 1990 = 3669.

Step by step solution

01

Step 1.  Calculating population in year 1990 

Let us assume that the population in year 1990 is x.

From given information

Population of Cresco in year2000 =3905

It means

Population in year 1990 + Increase in population from year 1990 to 2000 =3905

02

Step 2.  Substituting given value

On substituting value, we get

x+236=3905

03

Step 3.  Solving for value of x

On subtracting 236on both sides, we get

x+236-236=3905-236x=3905-236x=3669

x=3669

Therefore, the population of Cresco in year 1990 =x=3669.

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