In the video we just saw, we performed logarithmic regression for the height of a tree in feet over time and found our model equation to be y = 2.062 + 7.695 ln x where x is time in years. According to this model, how many years will it take for the tree to grow to 30 feet tall? Round your answer to the nearest tenth of a year and do not include units.



Answer :

Answer:

Step-by-step explanation:

We can find the number of years (x) it takes for the tree to grow to 30 feet (y) by solving the model equation for x. Here's how:

Set the model equation equal to 30 (desired height):

y = 2.062 + 7.695 ln(x) = 30

Isolate ln(x):

Subtract 2.062 from both sides:

ln(x) = (30 - 2.062) / 7.695 ≈ 3.712

Solve for x (find the anti-logarithm):

Important: We can't directly isolate x by dividing by ln because logarithms don't work like that. Instead, we need to take the exponent of both sides with base e (Euler's number, approximately 2.718). This operation is called the anti-logarithm and is often denoted by exp or e raised to the power of.

Formula: e^(ln(x)) = x  (where e is Euler's number)

Apply the anti-logarithm (exponent with base e) to both sides:

e^(ln(x)) = e^(3.712) ≈ 41.3 years  (rounded to nearest tenth)

Interpretation:

According to the model, it will take approximately 41.3 years for the tree to grow to 30 feet tall.

Note: It's important to remember that this is an estimate based on the provided logarithmic regression model. The actual growth rate of a tree can be influenced by various factors not considered in the model.