exam Maths Puzzle Numerical Ability

The graph of the equation below is an ellipse. What is the y-coordinate of the center of that ellipse?

(x+3)^2/5^2+(y+9)^2/8^2=1

i had gotten 9 but it was wrong

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exam Other Question
I need help on page #575 on question #20. I need to solve the roots of each quadratic equation using the factoring method, and place the equation in standard form before factoring:


X^2=10x-24


Thanks for your time. =)
 Subtract. write in simplest form.
2x/x-3 - 6/x-3