Add 7.3×107+1.8×107 . Which is the correct sum?(1 point)

Question

Responses

8.1×107
8.1 times 10 superscript 7 baseline

9.1×1014
9.1 times 10 superscript 14 baseline

9.1+107
9.1 plus 10 superscript 7 baseline

9.1×107

Answer 1

9.1 times 10 superscript 7 baseline

Answer 2

The population of a city is given as 3.45×106 . A nearby city has a population of 1.3×105 . What is the sum of the populations of the two cities in scientific notation?(1 point)
Responses

35.8+105
35.8 plus 10 superscript 5 baseline

3.58×106
3.58 times 10 superscript 6 baseline

4.75×105
4.75 times 10 superscript 5 baseline

4.75×1011

Answer 3

3.58×106

Answer 4

An empty dump truck weighs about 2.8×105 pounds. How much does it weigh if 15,300 pounds of trash is added? The answer should be in scientific notation.(1 point)
Responses

4.33×105 pounds
4.33 times 10 superscript 5 baseline pounds

29,530 pounds
29,530 pounds

2.953×105 pounds
2.953 times 10 superscript 5 baseline pounds

15,302.8 pounds

Answer 5

2.953×105 pounds

Answer 6

The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×1011 years longer. What is the half-life of uranium-238? The answer should be in decimal form.(1 point)
Responses

11,463,000,000
11,463,000,000

516,300,000,000
516,300,000,000

447,000,000,000
447,000,000,000

4.4637×1011

Answer 7

4.4637×1011

Answer 8

A mobile phone holds 1.28×1011 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

385.28×1011
385.28 times 10 superscript 11 baseline

512×109
512 times 10 superscript 9 baseline

385,280,000,000
385,280,000,000

5.12×1011

Answer 9

385.28×1011