Answer:
783.9
Explanation:
The same tool that gave you the answer to the second part will give you the answer to the first part.
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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.