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Veseljchak [2.6K]
3 years ago
8

Which values have exactly three significant figures? Check all that apply.

Mathematics
2 answers:
Nina [5.8K]3 years ago
5 0
Can I have the values to check?
Marat540 [252]3 years ago
5 0

Answer:

<h3>0.0230 grams </h3><h3>0.804 inches </h3><h3>140 feet </h3><h3>509 kilometers</h3>

Step-by-step explanation:

The given choices are

  • 0.0230 grams
  • 0.035 ounces
  • 0.804 inches
  • 3.150 liters
  • 140 feet
  • 509 kilometers

Significant figures refer to digit numbers that actually mean something to the measure. For examaple, 0.0230 grams has three significant figures, because there are three digits that give information of the measure. But, 0.035 ounces doesn't have three significant figures, because only two digits give information.

Having said that, all numbers with three significant figures are

  • 0.0230 grams
  • 0.804 inches
  • 140 feet
  • 509 kilometers

All these number have three significant figures because they have three digits that offer information about the measure.

The number 3.150 liters has 4 significant figures, that's why it's not part of the answer.

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Answer:

Greatest population density: Denmark

Smallest population density: The U.S.

Step-by-step explanation:

Population density = population / area

So let's find the population density of each country

For U.S

Population: 272,648,000

Area: 9,364,520 sq km

Population density: 272,648,000/9,364,520=29.1 ( rounded to the nearest tenth )

So the population density of the U.S is 29.1 people per sq km

For Denmark

Population: 5,248,000

Area: 42,077

Population density: 5,248,000/42,077=124.7 ( rounded to the nearest tenth )

So the population density of Denmark is 124.7 people per sq km

For Ghana

Population: 18,339,000

Area: 237,533

Population density: 18,339,000/237,533=77.2 ( rounded to the nearest tenth ).

So the population density of Ghana is 77.2 people per sq km

Now that we have calculated the population density of each country let's look back at the question

Which country has the greatest population density? Which country has the least?

Looking at the population densities we can conclude that Denmark has the largest population density at 124.7 people per sq km and the U.S. has the smallest population density at 29.1 people per sq km

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