# Conics Problem Part 2

temaire

## Homework Statement

This is the second page.
http://img116.imageshack.us/img116/7519/arch2iq9.jpg [Broken]​
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## Homework Equations

Formulas on picture above.

## The Attempt at a Solution

I'am just wondering if everything looks fine.

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For part (ii), I don't think that's how you would solve for b. There's a formula to solve for b. $$b^2=c^2-a^2$$ where c is your focii and a is the distance from your center (0,30) to the vertex of the hyperbola. a=10, c=30, then b=?
Whoops, I realized that the problem is using a different form of the vertical hyperbola instead of $$\frac{(y-k)^2}{a^2}-\frac{(x-h)^2}{b^2}=1$$, so in this case I switched a and b around.