Icannot answer this question involving derivatives and graph sketching, hope somebody can me solve it!
in advance

Graphically, the derivative of a function is the slope of the tangent line for each point. In the first figure, some points have a segment of their tangent line drawn. Between x = -6 and x = -2, the slopes are positive and decrescent as x reach -2. In point x = -2 the slope is equal to 0. Between x = -2 and x = 2, the slopes are negative and decrescent as x reach 2. Between x = 2 and x = 6, slopes still are negative but with crescent values, until x = 6 where slope is zero. Between x = 6 and x = 10, slopes are positive and crescent. In the second figure, f'(x) is shown.

the correct answer is the second option

i think it is 18

step-by-step explanation: