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.

3,355,397 students helped

Level 16 in Chemistry Level 14 in Astronomy Level 12 in Earth Science Level 11 in Trigonometry Level 11 in Geometry 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