exam Maths Puzzle Numerical Ability

Hello, I've struggled with conic sections for two months and keep getting the wrong answers.
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<b>Problem #6: "Find the foci for the ellipse and sketch a graph of <br> {{{4x^2+

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How do you solve this fraction?
12 over x-3 plus 5 over x squared minus 5x plus 6.
Suppose an object was 100 pounds when it is at sea level. Find the value of (c)that makes the equation true. (sea level is 3963 miles from the center of the earth. w=Cr^-2