Step 1: Find the volumes of the squares / rectangles. Formula: V = L * H (Hint: THE BOTTOM OF THE FIGURE COUNTS AS A RECTANGLE!!!) ((Hint 2: There are 7 squares / rectangles in all!!!))
Step 2: Find the volumes of all the triangles. Formula: L * H * 1/2 (Hint: 2 triangles in all. Most likely the same size, if so, just do 1 triangle!!!)
Step 3: Once found all the volumes of the figures, add all the values and that will be the volume of the whole figure!
You are basically breaking up the figure into separate shapes!
Hopefully this helped!!! :)