Write 80,000,000+4,000,000+100+8 in standard form

The answer is 84,000,108.

To solve this, you want to line up all the numbers to the right. You should also start from biggest number to smallest:

80,000,000
  4,000,000
            100
                8

From there, you simply add each column vertically, which results in 84,000,108.

The mode of the numbers is 29.