 In this video, we provide the solution to question number 10 for practice exam number 4 for math 12 10 in which case We are given the graph of the functions Derivative so this is the graph of f prime. We don't have the graph of f We have the graph of f prime, but we're still asked on which intervals is the original function f increasing Well, if the function f is increasing that means the derivative needs to be positive in that situation So where is the function positive? We see that from negative infinity up to zero It's positive. There's some type of discontinuity happening in zero But then from zero it continues on until we get to four So the function would be that the derivative is positive from negative infinity to zero Union zero to four and that's exactly where the function would then be increasing because when you go from four To what is that seven? Five six seven right from four to seven the derivative is negative Which means the function is actually decreasing right there. So the correct reply would be e