Algebra-1

1. Determine the number of doubling periods:

Since the tree's height doubles every year and we want to know its height after 3 years, the number of doubling periods  is equal to the number of years, which is .

2. Use the exponential growth formula:

The formula for exponential growth in this case is , where:

 is the final height of the tree.

 is the initial height of the tree. Here,

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