Respuesta :

The number is 129,407 in the standard form.

The correct answer is:

129,407.

Explanation:

12 ten thousands has a value of 12(10,000) = 120,000.

8 thousands has a value of 8(1000) = 8000.

14 hundreds has a value of 14(100) = 1400.

7 ones has a value of 7(1) = 7.

Together, this gives us 120,000+8000+1400+7 = 128000+1400+7 = 129400+7 = 129407.