<p>I am sure the B will not hurt you.
However, do not forget that there are 26000+ students who possibly have A’s in their classes.
My advice: write somewhere in your essay that “when i sleep, I dream of math solutions and differentiating. etc etc.” Just write about how much math scares you, and how you scare it too.
They will be interested in that. It is a part of the “applicant as a whole” concept. Personally, I hated math till my father sat me down. I just brought myself to love it.
Wrote a paragraph in my essay and how I spoke to a taxi cab driver about math. He was a math pro himself. </p>
<p>Just relax. It shall be well.</p>