Answer:
783.9
Step-by-step explanation:
The same tool that gave you the answer to the second part will give you the answer to the first part.
_____
You will note the box is checked saying "Log Mode". This mode uses linear regression on the logarithms of the y-values. When the box is unchecked, regression is used on the actual y-values.
The latter method tends to favor matching the larger y-values at the expense of matching smaller ones. It gives a different equation.