The graph shows a fir tree's diameter growth over a 50 year period.
What does the y-intercept represent?
The diameter of the fir tree at 1 year.
The diameter of the fir tree when planted.
The age of the fir tree when it was planted.
The unit rate for each year of growth.

The y-intercept is the initial diameter of the fir tree (10 inches). At the end of 50 years, the tree's diameter is 30 inches. Therefore, 30 − 10 = 20 inches of growth occurred over the 50 year period. The diameter of the fir tree when planted. The fir tree's diameter was 10 inches when it was planted.

The graph shows a fir tree's diameter growth over a 50 year period. What does the y-intercept represent? The diameter of the fir tree at 1 year. The diameter of the fir tree when planted. The age of the fir tree when it was planted. The unit rate for each year of growth.

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The graph shows a fir tree's diameter growth over a 50 year period.
What does the y-intercept represent?
The diameter of the fir tree at 1 year.
The diameter of the fir tree when planted.
The age of the fir tree when it was planted.
The unit rate for each year of growth.