Simply moved one of the edges forwards and then low it to z = 0 . Hopefully this is a correct to this exercise.
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At the bottom of the wedge, you see an edge.
Not a real problem. But we strive to have simplified objects.
Especially when evolving to complex mesh objects.
And the way textures work (future lessons).
Your object should contain six vertices! For an optimal sollution.
Have fun!
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I forgot to mention that I made this wedge before the " Vertices, Edges And Faces" lecture, where it’s taught to remove edges.
I’m sorry for that, but I’ve managed to remove the edge as taught in the lecture.
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Yeah you probably realise at this stage to turn this on if you want to intentionally merge moved verts or edges. 
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I actually didn’t know about that. 
But, thank you for telling me!
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