Question

Which pair of numbers shows the second number is an estimation of the first?(1 point)

0.00345; 0.004

0.00345; 0.003

345; 400

275; 200

Answer 1

Which number is correctly written in scientific notation?(1 point)

0.2520 × 10^−3

2.520 × 10^3

25.20 × 10^3

10 × 10^3

Answer 2

thats wrong bot

Answer 3

The age of Earth is about 4.6×10^9 years old. What is the number in decimal notation?(1 point)

46,000,000,000

4.6000000000

0.0000000046

4,600,000,000

Answer 4

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)

3.47866×10^7

34,870,000

3.487×10^7

3.47866×10^6

Answer 5

Bot, choose one of the options

3.47866×10^7

34,870,000

3.487×10^7

3.47866×10^6

Answer 6

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

1.429 × 10^−6

1.429 × 10^−5

1.429 × 10^−3

4.129 × 10^−4

Answer 7

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 point)

80.724×10^−18 kilometers

8.0724×10^−7 kilometers

8.0724×10^−14 kilometers

8.0724×10^−17 kilometers

Answer 8

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)

5+10^−7

5×10^7

−7×10^5

5×10^−7

Answer 9

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

3.9×10^−3+1.2×10^−3

3.5×10^3+1.6×10^−6

2.9×10^−3+1.2×10^−3

2.2×10^−1+2.9×10^−2

Answer 10

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 9×10^3 ft. higher than Denali. About how high is Mt. Everest? The answer should be in scientific notation.(1 point)
Responses

1.1×10^3 ft.

2.9×10^4 ft.

29,000 ft.

2.9×10^3 ft.

Answer 11

Write the answer in scientific notation, Bot

Answer 12

In 1500 CE, the world’s population was about 4.5×10^8. In 2020, the world’s population was about 7.8×10^9. Find how much the world’s population increased. (1 point)

12.3×10^9

8.25×10^9

7.35×10^9

3.3×10^9

Answer 13

In 2010, approximately 4.6×10^7 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)

7.20×10^7

4.34×10^7

434×10^7

4.34×10^2

Answer 14

There are about 6×10^19 atoms in a grain of sand. A cubic foot of sand can hold about 4×10^9 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)

2.4×10^28

2.4×10^29

24×10^29

24×10^28

Answer 15

Bot, the answer was actually 2.4×10^29

Answer 16

A gallon of water weighs about 8.3 lb. An Olympic-sized swimming pool holds 6.6×10^5 gallons. What is the approximate weight of the water in an Olympic-sized swimming pool? Write the answer in scientific notation.(1 point)

54.78×10^6lb.

5.478×10^6lb.

5.478×10^5lb.

54.78×10^5lb.

Answer 17

No bot, the answer is 5.478×10^6lb.

Answer 18

A penny weighs 5.8×10^−3 lb. How many pennies are in a pile of pennies that weighs 3.596×10^4 lb.? Write the answer in scientific notation.(1 point)

0.62×10^7

6.2×10^6

6.2×10^8

6.2×10^−7

Answer 19

A bank deposit yields $802.50 in interest every year. How many years will it take to yield 6.42×10^4 dollars? Write the answer in scientific notation.(1 point)

1.25×10^2

8×10^2

8×10^4

8×10^1

Answer 20

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Answer 21

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