I'm an Undergraduate Finance Major with a CS Minor, how can should I got about meeting the quantitative requirements?

So I'm junior with a major in Finance and a minor in CS. I've been thinking about applying to MSFE program sometime after I graduate, but I need to figure out how to get these mathematics prereqs out of the way.

I have a whole free semester during my Senior year, and I was thinking about using that to get a minor in Mathematics. At most, I can take:

Multivariable Calculus
Linear Algebra
Differential Equations
Intro to Numerical Analysis

How can I fulfil the rest of my requirements? Can I take eDX and coursera courses? Do I even need to bother with minor in Math and just take those on eDX or Coursera too? If I don't minor in Math, I was planning on using that semester to take courses that'll grant me an honors distinction anyway.