<p>Definitely need calculus for math; usually calc1-3 for math, cs/engineering. Job opportunities include working for companies that hire mathematicians, actuary, and teaching. Though actuary deals a lot with probability and statistics than applied math. </p>
<p>Graduate school usually helps get a higher starting salary, may give you better shot at starting a career if not recruited during undergraduate studies. People who do CS take Discrete Math after Calc.1 or 3; but if you don’t enjoy coding and learning computer languages than maybe engineering or taking the engineering and science classes required for med school is best. Math and Science or engineering is another popular combo.</p>