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# Tutor profile: Ethan O.

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Ethan O.
Math Major, Minor in Communication Studies
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## Questions

### Subject:Trigonometry

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Question:

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

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Ethan O.

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

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Question:

How do I find the derivative of a function?

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Ethan O.

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

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Question:

What do the letters in algebraic equations represent?

Inactive
Ethan O.

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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