<p>To answer your first question, unless you plan on going into academia (in which you will need a PhD), you may want to consider “applied” mathematics. Applied mathematics (like applied physics) will come closest to interacting with engineering. It is also possible to get a B.A./B.S. in applied math and go on to get a M.S./M.Eng in engineering but your graduate engineering degree will be limited to disciplines like industrial engineering, systems engineering, engineering mechanics or the emerging area of computational engineering/science.</p>
<p>As for your second question about B.A. vs. B.S. in Math, the answer is…depends on the school. I know that is a vague answer but let me give you details on why it depends on the school.</p>
<p>In some schools, the B.A. in Math will require 1-to-3 less math courses and won’t require the calculus-based physics or introductory chemistry, while requiring more liberal arts courses (read: foreign languages, cultural/diversity courses).</p>
<p>In few other schools, the B.A. in Math will require the SAME amount math courses and won’t require the calculus-based physics or introductory chemistry, while requiring more liberal arts courses (read: foreign languages, cultural/diversity courses).</p>
<p>In a few other schools, the B.A. in Math will require 1-to-3 less math courses while requiring more liberal arts courses (read: foreign languages, cultural/diversity courses) for the purpose of allowing enough elective courses to either dual major (with computer science, economics, etc).</p>
<p>All depends on the school.</p>
<p>Now here is MY $0.05 on choosing a certain math program. Choose the version of the degree that will meet YOUR needs because employers do not care if the degree is a B.A. or a B.S. You have good schools like a Cal-Berkeley or Vanderbilt who only offer a B.A. in math (and Cal-Berkeley is highly ranked). You have schools like UCLA who offer only a M.A. at the graduate level but are highly-ranked in applied mathematics (at the grad level).</p>
<p>Like a I mentioned before, I would consider and more applied math degree. It is more marketable. Also, although on this site we are usually against double/dual majors, probably mathematics and computer science are the only 2 disciplines that should be considered for a double/dual major if anything.</p>
<p>Note: I did both. My B.S. is in Computational Mathematics (basically a math/CS hybrid degree) and my M.S. is in Engineering (no engineering specialization on my degree but it was geared more to systems engineering).</p>
<p>Hope this helps.</p>