### Home > CALC > Chapter 9 > Lesson 9.1.2 > Problem9-26

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