### Home > CALC > Chapter 9 > Lesson 9.1.2 > Problem 9-26

9-26.

Let *x* = *BP*.

Now write expressions for *AB* and *CP*.

The function for the cost is *y* = 20(*AP*) + 10(*CP*).

Once you have written the cost function in terms of *x*, differentiate and determine the value of *x* that yields a miniumum.

*x* ≈ 57.735 ft

Note: This is not the answer to the question being asked.