Oscar L.

Hello, I am an engineer for ArcelorMittal, Inc. in the USA with a strong math and science background and an interest in helping others learn. I am living in Chicago and am 55 years old as of the beginning of 2016.

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Level 16 in Chemistry Level 14 in Astronomy Level 12 in Earth Science Level 11 in Geometry Level 11 in Trigonometry Level 6 in Algebra Level 6 in Astrophysics Level 3 in Organic Chemistry I Level 3 in Physics Level 2 in Precalculus Level 2 in World History Level 1 in Calculus