Researchers estimate that there are about 7,000 to 35,000 U.S. tons of plastic debris in the ocean. There are 2,000 pounds in a U.S. ton. Which of these is correct scientific notation for the number of pounds in 35,000 U.S. tons?
35000 x 2000 =
[3.5 x 10^4] * [ 2 x 10^3] = [we can multiply in any convenient order]
[3.5 x 2] * [10^4 x 10^3] =
7 x 10^7
