### Home > APCALC > Chapter 3 > Lesson 3.4.1 > Problem 3-155

3-155.

Re-examine your graph of

As accurately as possible, draw a tangent to

at. Estimate its slope.The tangent line should look vertical. What is the slope of a vertical line?

According to your derivative,

what is the slope of the tangent at?Refer to hints in problem 3-154.