Subtract 4.66×10^−5−7.34×10^−7 (1 point)
−2.68×10^2
4.5866×10^−5
2.68×10^2
−4.5866×10−5
4.5866×10^−5
The U.S. national debt was $2.9617×10^13 in 2021 and $3.98×10^11 in 1971. Find how much the debt increased in the 50-year period. (1 point)
$2.9219×1011
$2.9219×1013
$3.0015×1013
$1.0183×1024
To find how much the debt increased in the 50-year period, we need to subtract the debt in 1971 from the debt in 2021.
$2.9617×10^13 - $3.98×10^11 = $2.9219×10^13
Therefore, the debt increased by $2.9219×10^13.
The size of a hydrogen atom is about 1.2×10^−10 m across. The size of an oxygen atom is 0.000000000152 m across. What is the difference between the sizes of these atoms in scientific notation?(1 point)
Responses
3.2×10^−11 m
3.2×10^−9 m
2.72×10^−10 m
3.2 ×10^−10 m
To find the difference between the sizes of the hydrogen and oxygen atoms, we need to subtract the size of the hydrogen atom from the size of the oxygen atom.
0.000000000152 m - 1.2×10^−10 m = 3.2 ×10^−10 m
Therefore, the difference between the sizes of these atoms in scientific notation is 3.2 ×10^−10 m.
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?(1 point)
To determine which blood component has a bigger diameter and by approximately how much, we need to compare the diameters of the two components.
The diameter of the platelet is 2.33×10^−6 m.
The diameter of the red blood cell is 0.0000075 m.
To compare these values, we can convert the second measurement to scientific notation:
0.0000075 m = 7.5×10^−6 m
Comparing these values, we can see that the diameter of the red blood cell (7.5×10^−6 m) is larger than the diameter of the platelet (2.33×10^−6 m).
To determine the approximate difference, we subtract the diameter of the platelet from the diameter of the red blood cell:
7.5×10^−6 m - 2.33×10^−6 m = 5.17×10^−6 m
Therefore, the red blood cell has a larger diameter than the platelet, and the approximate difference between their diameters is 5.17×10^−6 m.
China and India are the most populous countries in the world. China’s population is approximately 1.45×10^9 , while India’s population is approximately 1,400,000,000. How many more people live in China than in India?(1 point)
To find out how many more people live in China than in India, we subtract the population of India from the population of China:
1.45×10^9 - 1,400,000,000 = 500,000
Therefore, there are 500,000 more people living in China than in India.
To subtract the given numbers in scientific notation, you need to ensure that the exponents are the same. Here's how to do it:
1. Begin by subtracting the decimal values without considering the exponents:
4.66×10^(-5) - 7.34×10^(-7) = 4.66×10^(-5) - 0.0734×10^(-5)
2. Next, simplify the subtraction of the decimal values:
4.66 - 0.0734 = 4.5866
3. Now, write the result in scientific notation:
4.5866×10^(-5)
So, the correct answer is 4.5866×10^(-5).