# Tutor profile: Ethan O.

## Questions

### Subject: Trigonometry

How do I convert from decimal degrees to degrees, minutes, and seconds?

First, you take your number (in degrees) and separate the whole number from the decimal number (34.137 becomes 34 + .137). Then, multiply the decimal by 60, for 60 minutes (.137 * 60 = 8.22). Then, separate the whole number of that product from the decimal number (8.22 becomes 8 + .22). Multiply that decimal by 60, for 60 seconds (.22 * 60 = 13.2). Finally, put the whole number of your original number with the whole number from your first product and the second product, and you have your conversion (34 degrees, 8 minutes, and 13.2 seconds).

### Subject: Calculus

How do I find the derivative of a function?

One way (which is the easiest) to find the derivative is to take the power of each variable (for example, X to the 2nd power or X^2), and multiply that number by the variable (2X^2), then subtract 1 from the power (2X^2 becomes 2X). The constant(s) in the equation then become zero (ex: the derivative of X^2 + 5 is 2X + 0, or 2X).

### Subject: Algebra

What do the letters in algebraic equations represent?

The letters are, essentially, unknown numbers. When you solve an algebraic equation, you are finding the solution(s) to those unknown numbers.

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