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. Write an equation for a line of best fit. What are the units for the slope and $y$-intercept in the equation?

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