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## Homework Statement

http://img103.imageshack.us/img103/3784/arch3tf0.jpg [Broken]

[/URL]## Homework Equations

On picture above

## The Attempt at a Solution

Again, I just want someone to check my work.

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- Thread starter temaire
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- #1

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http://img103.imageshack.us/img103/3784/arch3tf0.jpg [Broken]

[/URL]On picture above

Again, I just want someone to check my work.

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- #2

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c=distance from center to focii, a = distance from center to vertex

Incidentally, you don't need to calculate for a since it's given.

- #3

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Whoops, I realized that the problem is using a different form of the vertical hyperbola instead of [tex]\frac{(y-k)^2}{a^2}-\frac{(x-h)^2}{b^2}=1[/tex], so in this case switch a and b. In the other problem, where b=10 is correct.

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- #4

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We haven't used the terms focus or focii with these problems in class. What do you mean by them?

- #7

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Do you mean the center?

- #8

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In a parabola, the there is only one focus. Since this parabola opens down, then the focus is at (h,-c+k).

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