What is a function for which every secant line has a parallel tangent in between the points of secancy.

  a continuous and differentiable function

Step-by-step explanation:

We assume this is a vocabulary question, not one seeking an instance of such a function. The description is of a continuous and differentiable function.

The mean value theorem says there is at least one point in the interval (a, b) where the derivative of a continuous and differentiable function is the same as the average slope between the end points of the interval. The tangent at that point is parallel to the secant line.

answer: 59

step-by-step explanation:

c. (3,2,6) is the answer.