### Home > PC > Chapter 4 > Lesson 4.3.1 > Problem 4-129

4-129.

**Challenge:** A tree is growing at a rate of *t* feet per year. Rocky finds the point where he can stand just in the shadow of the tree. Rocky is 6 feet tall and has stopped growing. The tree is currently 20 feet tall. Find Rocky’s distance from the tree as a function of *t* and *θ*. Homework Help ✎

Let the distance from the tree to Rocky be *d* and the distance from Rocky

to the tip of his shadow be *x*. Write two tan equations and solve.