Answer: 24.99 ft
Explanation:
1. You can find the angle A as following:
![A=arctan((5)/(8))\\A=32\°](https://img.qammunity.org/2020/formulas/mathematics/high-school/3cw5llpf82snyvvalxh7d69fx7igdbl007.png)
2. Now, you can calculate the height of the tree as following:
![tan(A)=(opposite)/(adjacent)](https://img.qammunity.org/2020/formulas/mathematics/high-school/24m9mrcqdnh37quarll9hwpv7zdgipkv03.png)
Where:
A=32°
opposite=x
adjacent=40
3. When you substitute values and solve for x, you obtain that the height of the tree in feet is:
![tan(A)=(x)/(40)\\x=40*tan(32\°)\\x=24.99](https://img.qammunity.org/2020/formulas/mathematics/high-school/s5947m3i58c13t7pp4gnxkqmu5xnfrjor8.png)