Beijing has 20.7 million people and an area of 16,400km^2. shanghai has 23.7 million people and an area of 6300km^2. how many times as great is the population density of shanghai as beijing. a. about the same b. about 2 times as great c. about 3 times as great d. about 6 times as great

The correct answer is C. Shanghai's population density is about 3 times as great as Beijing's.

Step-by-step explanation:

Population density is obtained from dividing the population number by the area number. Therefore, in order to answer the question we have to obtain the population density of each city first.

Beijing: 20,700,000 / 16,400 = 1,262.19 per km2

Shanghai: 23,700,000 / 6,300 = 3,761.90 per km2

3,761.90 / 1,262.19 = 2.98

Therefore, according to the calculations shown, Shanghai's population density is about 3 times as great as Beijing's.

19.

step-by-step explanation:

you add the 9 in the tens column since it is a single digit and 9 plus zero is 9 so it is 19

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.