49% of what number means 49% multiplied by a number. You probably want to replace ‘a number’ with a single letter variable. And it’s also probably convenient to convert the percentage into a decimal …

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## What is the circumference of a circle?

We usually start thinking about distances as straight lines. But distances can also be measured along curved lines, like the outside of a circle. You can think of rolling up a straight line to get a …

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## Tutoring Business Calculus, Linear Equations in Business Situations

We spent some time looking at linear equations in business situations. Profit, cost, revenue, and demand. They work like similar problems, just with business concepts incorporated. They tend to use …

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## Tutoring RLS Calculus, Reviewing Optimization

We mostly went over review problems that had to do with optimization, much like the earlier test. One problem had three variables, therefore it had one primary equation and two secondary equations. …

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## Tutoring Business Calculus, Looking more at limits and logs

Limits mean going towards something. Sometimes you approach a different point from the left and right. Most of the limit problems we saw have the limit of f(x) as x goes to some number, often times …

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## Tutoring Business Calculus, Two types of interest rate equations

Spent a bit of time on problems with the definition of the derivative. It's like getting a slope with the distance between two points being h, and then h goes to zero. At a min or max, the derivative …

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