Platelets and red blood cells are components of the blood. A typical platelet and red blood cell have diameters of approximately 2.33×10−6 m and 0.0000075 m, respectively. Which blood component has a bigger diameter, and approximately by how much?

Answer 1

To compare the diameters of the blood components, we need to find the difference between the diameters of the platelets and red blood cells.

The diameter of a platelet is approximately 2.33×10^(-6) m.
The diameter of a red blood cell is approximately 0.0000075 m.

To find the difference, we subtract the diameter of the platelet from the diameter of the red blood cell:

Difference = Diameter of red blood cell - Diameter of platelet
Difference = 0.0000075 m - 2.33×10^(-6) m

Using scientific notation for easy comparison, we have:

Difference = 7.5×10^(-6) m - 2.33×10^(-6) m
Difference = 5.17×10^(-6) m

Therefore, the red blood cell has a bigger diameter than the platelet by approximately 5.17×10^(-6) m.

Answer 2

China and India are the most populous countries in the world. China’s population is approximately 1.45×109 , while India’s population is approximately 1,400,000,000. How many more people live in China than in India?

Answer 3

To find out how many more people live in China than in India, we subtract the population of India from the population of China.

Population of China = 1.45×10^9
Population of India = 1,400,000,000

Difference = Population of China - Population of India
Difference = 1.45×10^9 - 1,400,000,000

Using scientific notation for easy comparison, we can convert the population of India to scientific notation:

Population of India = 1.4×10^9

Now we can subtract the population of India from the population of China:

Difference = 1.45×10^9 - 1.4×10^9
Difference = 0.05×10^9

To simplify, we can convert 0.05×10^9 to standard form:

Difference = 0.05×10^9
Difference = 5×10^7

Therefore, China has approximately 50,000,000 (or 50 million) more people than India.