I have this Riemann sum question: and I thought I knew how to do the left hand riemann sum but now I'm unsure. Basically I've used it before but when I try to with these points I'm just getting really confused because they're all under the x-axis. I had to kind of do it upside down. My answer was -13.5 but I wasn't sure if I should make it 13.5 because it's the area? Also, can you check to see if I did the math right for it? 13.5 negative or positive could be wrong :/ Thanks!