Another Douglas fir and another bald cypress each have a diameter of 150 cm Estimate the difference between the ages of these two trees.

## Step 1:<br />First, to estimate the age of each tree, we need to use their lifespan ratios, also known as tree growth rates. The formula to estimate the age is given by diameter divided by the growth rate.<br /><br />Different types of trees have different growth rates, hence differing girth for the same anatomical age.<br /><br />## Step 2:<br />Growth rate for a Douglas fir tree is around 12 cm per 10 years and 6cm per 10 years for the Bald Cypress.<br /><br />### To calculate the age of these trees we'd use this formula: <br /><br />### \[\text{Age} = \frac{\text{Diameter}}{\text{Growth Rate Per Year}} \times 10\]<br /><br />## Step 3:<br />Calculate the age of the Douglas fir by inserting 150 cm to the diameter and 12 cm per 10 years as the growth rate into the formula:<br /><br />Age of the Douglas fir = \(\frac{150}{1.2} \times 10 = 1250 \) years<br /><br />## Step 4:<br />Similarly, do calculations for the Bald Cypress by calculating 150 cm as the diameter and 6 cm per 10 years as the growth rate:<br /><br />Age of Bald Cypress = \( \frac{150}{0.6} \times 10 = 2500\) years<br /><br />## Step 5:<br />Lastly, we calculate the difference in ages. The formula for this would be:<br /><br />### \[\text{Difference in age } = \text{ Age of the older tree - Age of the younger one }\]<br /><br />Into this formula we put the calculated values:<br /><br />So, the difference in age = 2500 years - 1250 years