7. Which of the following is the standard form of 2,000,000 + 800,000 + 40,000 + 5,000 + 600 + 70 + 9?

The correct answer is 2,845,698.

millions |
thousands |
ones |

- |
- |
2 |
8 |
4 |
5 |
6 |
7 |
9 |

To convert the given number from expanded form to standard form, we need to add up all the individual place values.

2,000,000 represents two million (2,000,000)

800,000 represents three hundred thousand (800,000)

40,000 represents forty thousand (40,000)

5,000 represents five thousand (5,000)

600 represents six hundred (600)

70 represents seventy (70)

9 represents nine (9)

Adding up all the place values, we get:2,000,000 + 800,000 + 40,000 + 5,000 + 600 + 70 + 9 = 2,345,698Therefore, the standard form of 2,000,000 + 800,000 + 40,000 + 5,000 + 600 + 70 + 9 is 2,845,698.