Subtract 4.66×10^−5 − 7.34×10^−7 (1 point)
Responses
−2.68×102
negative 2.68 times 10 squared
−4.5866×10−5
negative 4.5866 times 10 superscript negative 5 baseline
4.5866×10−5
4.5866 times 10 superscript negative 5 baseline
2.68×102
2.68 times 10 squared
−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)
Responses
$1.0183×1024
1.0183 dollars times 10 superscript 24 baseline
$2.9219×1013
2.9219 dollars times 10 superscript 13 baseline
$2.9219×1011
2.9219 dollars times 10 superscript 11 baseline
$3.0015×1013
3.0015 dollars times 10 superscript 13 baseline
To find the increase in the debt over 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
3.2×10−9 m
3.2 times 10 superscript negative 9 baseline m
2.72×10−10 m
2.72 times 10 superscript negative 10 baseline m
3.2 ×10−10 m
3.2 times 10 superscript negative 10 baseline m
3.2×10−11 m
3.2 times 10 superscript negative 11 baseline m
To find the difference between the sizes of the 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 = 0.000000000152 m - 0.00000000012 m = 0.000000000032 m
This can be written in scientific notation as 3.2×10^−11 m.
Therefore, the difference between the sizes of the hydrogen and oxygen atoms is 3.2×10^−11 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)
Responses
A red blood cell has a bigger diameter than a platelet by 5.17×10−6 m.
A red blood cell has a bigger diameter than a platelet by 5.17 times 10 superscript negative 6 baseline m.
A red blood cell has a bigger diameter than a platelet by 9.83×10−6 m.
A red blood cell has a bigger diameter than a platelet by 9.83 times 10 superscript negative 6 baseline m.
A platelet has a bigger diameter than a red blood cell by 5.17×10−6 m.
A platelet has a bigger diameter than a red blood cell by 5.17 times 10 superscript negative 6 baseline m.
A platelet has a bigger diameter than a red blood cell by 9.83×10−6 m.
A platelet has a bigger diameter than a red blood cell by 9.83 times 10 superscript negative 6 baseline m.
To determine which blood component has a bigger diameter, we can compare the given diameters of the platelet and red blood cell.
Diameter of a platelet: 2.33×10^−6 m
Diameter of a red blood cell: 0.0000075 m
Comparing these values, we see that the red blood cell has a bigger diameter than the platelet.
To find the approximate difference, we subtract the diameter of the platelet from the diameter of the red blood cell:
0.0000075 m - 2.33×10^−6 m = 0.0000075 m - 0.00000233 m = 0.00000517 m
This can be written in scientific notation as 5.17×10^−6 m.
Therefore, a red blood cell has a bigger diameter than a platelet by approximately 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)
Responses
5×1010
5 times 10 superscript 10 baseline
5×107
5 times 10 superscript 7 baseline
5×108
5 times 10 superscript 8 baseline
5×109
5 times 10 superscript 9 baseline
To find the difference in population between China and India, we need to subtract the population of India from the population of China.
Population of China: 1.45×10^9
Population of India: 1,400,000,000
Subtracting these values, we get:
1.45×10^9 - 1,400,000,000 = 500,000,000 = 5×10^8
Therefore, there are 500,000,000 more people living in China than in India, which can be written as 5×10^8.
3/5
A
D
A
D
D
Those are the correct answers