At an aunt’s wedding, Nicolas collected data about an ice sculpture that was about to completely melt. A graph of his data is shown at right.

1. Calculate the equation of a line of best fit.

   Hint (a):

   Use $y=mx+b$.

2. Based on your equation, how tall was the ice sculpture one hour before Nicolas started measuring?

   Hint (b):

   Read this question carefully.

   Answer (b):

   $12.5$ inches