To write 770,000 in scientific notation, you express it as a number between 1 and 10 multiplied by a power of 10.
First, you need to move the decimal point in 770,000 so that there is one non-zero digit to its left. This results in:
\[ 7.7 \]
Next, you count how many places you moved the decimal point to get from 770,000 to 7.7. In this case, you move the decimal point 5 places to the left.
Thus, you express this as:
\[ 7.7 \times 10^5 \]
So, 770,000 in scientific notation is:
\[ 7.7 \times 10^5 \]