If we use the equation of the trend line, y = 12 x + 133, to estimate the number of calories in a fast food item that has 15 grams of fat, we find that there are approximately 313 calories in an item having 15 grams of fat. this is an example of the data. correlating extrapolating interpolating

I believe the answer to this is interpolating

A trendline is a line that gives the approximate relationship between the variables in the problem. It doesn't give exact values, only estimations. So when we found that 313 calories goes with 15 grams of fat, we found an estimation of the data.

So i believe interpolating should be your answer.

Hope this helped :)
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