A skyscraper has a mass of 2.2 x 10^5 tons. Another skyscraper in the same town has a mass of 3.7 x 10^5 tons. What is the combined mass in tons of the two skyscrapers? Use scientific notation to express your answer to 1 decimal place.
The combined mass of the two skyscrapers is 6.9 x 10^5 tons.
An insect is 4 x 10^-2 inches long. a second insect is 1.3 x 10^-1 inches long. What is the total length of the two insects in inches? Use scientific notation to express your answer to 1 decimal place.
The total length of the two insects is 1.7 x 10^-1 inches.
What is the sum of 6.3 x 10^3 and 2.41 x 10^4? Use scientific notation to express your answer.
The sum of 6.3 x 10^3 and 2.41 x 10^4 is 2.05 x 10^4.
An American football field has an area of 6.4 x 10^3 square yards long. A Canadian football field is 3,350 square yards long. What is the area of a Canadian football field? Write your answer in scientific notation to 2 decimal places.
The area of a Canadian football field is 3.35 x 10^3 square yards.
A human hair has a diameter of about 4 x 10^-3 inches. A fingernail is about 0.011 inches thicker. How thick is a fingernail? Write your answer as a decimal to 3 places.
The thickness of a fingernail is 0.015 inches.
I got three THINGS WRONG.
1: 5.9 x 10^5
2: 1.7 x 10^-1
3: 3.04 x 10^4
4: 9.75
5: 0.015