To express the number 2,800,000 in scientific notation, we first need to identify how many places we have to move the decimal point to reformulate the number.
We start with the number 2,800,000 and find that we can write it as 2.8 when we move the decimal point 6 places to the left. This gives us:
2.8
Next, because we moved the decimal point 6 places, we multiply by 10 raised to the power of 6 to account for this shift:
2.8 × 106
Thus, the scientific notation for 2,800,000 is 2.8 × 106.