Once you study algebra and trigonometry and are comfortable with these
topics, the next step is calculus. To be successful in
calculus, you need a solid foundation in algebra: how to factor,
simplify fractions, solve equations, find equations of lines and more.
The above videos will introduce you to the concept of derivatives (think
slope) and integrals (think area).
Calculus has applications in business operations. For example find
the price (or quantity) that maximizes the revenue, finding the
dimensions that minimizes the cost to construct a box, how fast the
profit is changing at different levels of production.
Following the above videos and are comfortable with the concepts,
you can move on to the videos from MIT called
Multivariable Calculus.