Which number is correctly written in scientific notation?(1 point)
Responses
2.520 × 10^3
25.20 × 10^3
0.2520 × 10−3
10 × 10^3

1 year ago

1 year ago
The age of Earth is about 4.6×109
years old. What is the number in decimal notation?(1 point)

1 year ago
4,600,000,000

1 year ago
Use scientific notation to compare these numbers: 3,478,660; 34,870,000; and 34,786,600. Which number has the greatest value?(1 point)

1 year ago
To compare the numbers using scientific notation, we need to convert them to the same power of 10.
3,478,660 = 3.47866 × 10^6
34,870,000 = 3.487 × 10^7
34,786,600 = 3.47866 × 10^7
Comparing the coefficients, we see that 3.487 × 10^7 is the greatest value.

1 year ago
Question
The density of oxygen is about 1.429 × 10−4
grams per liter. Which number is higher than 1.429 × 10−4
?(1 point)

1 year ago
To determine which number is higher than 1.429 × 10^-4, we need to compare the coefficients of the numbers:
1.429 × 10^-4 (original number)
0.001 (1 x 10^-3) (higher number)
Comparing the coefficients, we see that 0.001 (1 x 10^-3) is higher than 1.429 × 10^-4.

1 year ago
Convert 8.0724×10−12
centimeters to kilometers. Express the answer to the exact decimal place.
Note: 1 kilometer is equal to 100,000 centimeters.

1 year ago
To convert 8.0724 × 10^-12 centimeters to kilometers, divide by 100,000:
8.0724 × 10^-12 cm = 8.0724 × 10^-17 km
So, the answer, expressed to the exact decimal place, is 8.0724 × 10^-17 kilometers.

1 year ago
Linda converted 0.0005 liters to milliliters using a calculator. The calculator displayed the number 5E−7
. What is this number in scientific notation?(1 point)

1 year ago
The number 5E-7 is already in scientific notation. In expanded form, it would be 5 × 10^-7.

1 year ago
Which expression is equal to 5.1×10−3
?(1 point)

1 year ago
The expression that is equal to 5.1 × 10^-3 is:
0.0051

1 year ago
wrong

1 year ago
Apologies for the incorrect response.
The expression that is equal to 5.1 × 10^-3 is:
0.0051

1 year ago
Which expression is equal to 5.1×10−3
?(1 point)
Responses
3.9×10^−3+1.2×10^−3
2.9×10^−3+1.2×10^−3
2.2×10^−1+2.9×10^−2
3.5×10^3+1.6×10^−6

1 year ago
The expression that is equal to 5.1 × 10^-3 is:
2.9 × 10^-3 + 2.2 × 10^-3

1 year ago
Denali, which is about 20,000 ft. above sea level, is the highest mountain in the United States. Mt. Everest, the highest mountain on earth, is about 9×103
ft. higher than Denali. About how high is Mt. Everest? The answer should be in scientific notation.(1 point)

1 year ago
To find the height of Mt. Everest, we need to add the difference in elevation to the height of Denali.
Denali: 20,000 ft = 2 × 10^4 ft
Mt. Everest: 9 × 10^3 ft higher than Denali
Adding the two values, we get:
2 × 10^4 ft + 9 × 10^3 ft = 2.9 × 10^4 ft
Therefore, Mt. Everest is approximately 2.9 × 10^4 ft in height.

1 year ago
In 1500 CE, the world’s population was about 4.5×108
. In 2020, the world’s population was about 7.8×109
. Find how much the world’s population increased. (1 point)

1 year ago
To find the increase in the world's population from 1500 CE to 2020, we need to subtract the population in 1500 from the population in 2020.
Population in 1500 CE: 4.5 × 10^8
Population in 2020: 7.8 × 10^9
Increase in population: (7.8 × 10^9) - (4.5 × 10^8)
To subtract these values, we need to align the exponents:
7.8 × 10^9 - 0.45 × 10^10
Now, subtracting the coefficients, we get:
7.8 - 0.45 = 7.35
Therefore, the world's population increased by approximately 7.35 × 10^9 from 1500 CE to 2020.

1 year ago
In 2010, approximately 4.6×107
tons of paper were recycled. In the same year, an estimated 2,600,000 tons of plastics were recycled. How many more tons of paper was recycled than plastic in 2010?(1 point)

1 year ago
To find out how many more tons of paper were recycled than plastic in 2010, we need to subtract the amount of recycled plastic from the amount of recycled paper.
Recycled paper: 4.6 × 10^7 tons
Recycled plastic: 2,600,000 tons
To align the units, we need to convert the recycled plastic to scientific notation:
Recycled plastic: 2.6 × 10^6 tons
Now we can subtract the values:
4.6 × 10^7 tons - 2.6 × 10^6 tons
To subtract these values, we need to align the exponents:
46 × 10^6 tons - 2.6 × 10^6 tons
Now, subtracting the coefficients, we get:
46 - 2.6 = 43.4
Therefore, there were approximately 43.4 million more tons of paper recycled than plastic in 2010.

1 year ago
There are about 6×1019
atoms in a grain of sand. A cubic foot of sand can hold about 4×109
grains of sand of average size. Using those figures, how many atoms would you expect to find in a cubic foot of sand? Write the answer in scientific notation.(1 point)

1 year ago
To find the number of atoms in a cubic foot of sand, we need to multiply the number of atoms in a single grain of sand by the number of grains in a cubic foot.
Number of atoms in a grain of sand: 6 × 10^19 atoms
Number of grains of sand in a cubic foot: 4 × 10^9 grains
To calculate the number of atoms, we multiply these values:
6 × 10^19 atoms/grain * 4 × 10^9 grains/ft^3
Multiplying the coefficients and adding the exponents, we get:
6 * 4 × 10^19 * 10^9 = 24 × 10^28
We can simplify this to:
2.4 × 10^29
Therefore, you would expect to find approximately 2.4 × 10^29 atoms in a cubic foot of sand.