Add 7.3×10^7+1.8×10^7 . Which is the correct sum?(1 point)
Responses
9.1×10^7
9.1 times 10 superscript 7 baseline
9.1+10^7
9.1 plus 10 superscript 7 baseline
9.1×10^14
9.1 times 10 superscript 14 baseline
8.1×10^7
The correct sum is 9.1×10^7.
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)
Responses
4.75×10^5
4.75 times 10 superscript 5 baseline
4.75×10^11
4.75 times 10 superscript 11 baseline
35.8+10^5
35.8 plus 10 superscript 5 baseline
3.58×10^6
3.58 times 10 superscript 6 baseline
The sum of the populations of the two cities in scientific notation is 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)
Responses
29,530 pounds
29,530 pounds
4.33×10^5 pounds
4.33 times 10 superscript 5 baseline pounds
2.953×10^5 pounds
2.953 times 10 superscript 5 baseline pounds
15,302.8 pounds
The weight of the dump truck with 15,300 pounds of trash added is 4.43×10^5 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)
Responses
447,000,000,000
447,000,000,000
516,300,000,000
516,300,000,000
11,463,000,000
11,463,000,000
4.4637×10^11
The half-life of uranium-238 is 4.463×10^11 years.
A mobile phone holds 1.28×10^11 bytes of storage. You can also pay more money to get an additional 384,000,000,000 bytes. How much storage would your phone have if you buy the additional bytes? The answer should be in scientific notation.(1 point)
Responses
385.28×10^11
385.28 times 10 superscript 11 baseline
385,280,000,000
385,280,000,000
512×10^9
512 times 10 superscript 9 baseline
5.12×10^11
5.12 times 10 superscript 11 baseline