Calculate 6.25×10^6−4.73×10^6 . Express your answer in scientific notation to 2 decimal places.
To subtract these numbers in scientific notation, we need to have the same exponent. Let's convert them to have the same exponent of 10 by moving the decimal point:
6.25×10^6 = 6250000
4.73×10^6 = 4730000
Now we can subtract:
6250000 - 4730000 = 1520000
To express this in scientific notation, we need to move the decimal point so that there is only one non-zero digit before it:
1520000 = 1.52×10^6
Therefore, 6.25×10^6 - 4.73×10^6 = 1.52×10^6.
Human hair grows at a rate of about 6.849×10^−4 cm per hour to 2.329×10^−2 cm per hour. The rate depends on gender, genetics, age, and health. Find the difference between the high end and the low end of the range. Express your answer in scientific notation. Do not round your answer.(1 point)
Find 0.078−(5.2×10^−3) . Express your answer in scientific notation. Do not round your answer.(1 point)
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
The average distance from Earth to Mars is 2.25×10^8 km, and the distance from Earth to Neptune is 4.3514×10^9 km. How much farther is Neptune from Earth than Mars? Express your answer in scientific notation. Do not round your answer.(1 point)
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
To subtract these numbers, we need to have the same exponent. Let's convert them to have the same exponent of 10:
$2.9617×10^13 = $29.617×10^12
$3.98×10^11 = $0.398×10^12
Now we can subtract:
$29.617×10^12 - $0.398×10^12 = $29.219×10^12
Therefore, the debt increased by $29.219×10^12 in the 50-year period.
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 these 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
To subtract these numbers, we need to have the same exponent. Let's convert the size of the oxygen atom to scientific notation:
0.000000000152 m = 1.52×10^-10 m
Now we can subtract:
1.52×10^-10 m - 1.2×10^-10 m = 0.32×10^-11 m
Therefore, the difference between the sizes of these atoms is 0.32×10^-11 m or 3.2×10^-12 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