# Tutor profile: Dustin R.

Inactive

Dustin R.

Tutor for a year and a half

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## Questions

### Subject: Pre-Calculus

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Question:

What is the difference quotient and what is it used for?

Inactive

Dustin R.

Answer:

The difference quotient is (f(x+h)-f(x))/h. It is used in calculus to determine the limit of a given function.

### Subject: Statistics

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Question:

What does the R-squared value measure?

Inactive

Dustin R.

Answer:

The R-squared value, also known as the coefficient of determination, measures how closely the data is to the fitted regression line.

### Subject: Algebra

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Question:

How do you solve a quadratic equation?

Inactive

Dustin R.

Answer:

There are three methods for solving a quadratic equation. The first, factoring, will work on all equations, but is the simplest to perform. In addition to factoring, there is also the use of the quadratic formula, or the method of completing the square. The latter two methods will produce the correct solution every time.

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