The population of a city is given as 3.45×10^6 . A nearby city has a population of 1.3×10^5 . What is the sum of the populations of the two cities in scientific notation?(1 point)
3.58×10^6
35.8+10^5
4.75×10^11
4.75×10^5
5 answers
3.45×10^6 + 1.3×10^5 = 3.45×10^6 + 0.13×10^6 = 3.58×10^6
An empty dump truck weighs about 2.8×10^5 pounds. How much does it weigh if 15,300 pounds of trash is added? The answer should be in scientific notation.(1 point)
15,302.8 pounds
4.33×10^5 pounds
2.953×10^5 pounds
29,530 pounds
15,302.8 pounds
4.33×10^5 pounds
2.953×10^5 pounds
29,530 pounds
2.8×10^5 + 1.53×10^4 = 2.8×10^5 + 0.153×10^5 = 2.953×10^5 pounds
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×10^11 years longer. What is the half-life of uranium-238? The answer should be in decimal form.(1 point)
447,000,000,000
4.4637×10^11
516,300,000,000
11,463,000,000
447,000,000,000
4.4637×10^11
516,300,000,000
11,463,000,000
To find the half-life of uranium-238, we need to add the additional 4.463×10^11 years to the half-life of uranium-235 (700,000,000 years).
700,000,000 + 4.463×10^11 = 700,000,000 + 446,300,000,000 = 446,300,000,000
Therefore, the half-life of uranium-238 is 446,300,000,000 years.
700,000,000 + 4.463×10^11 = 700,000,000 + 446,300,000,000 = 446,300,000,000
Therefore, the half-life of uranium-238 is 446,300,000,000 years.