book Maths Puzzle Numerical Ability

Hi Tutors:
I have been reading and looking up topics on various Math help sites, yet I am as lost as ever.
PROBLEM: Find the intersection point (if there is one) and graph, shad

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book Other Question

List all pairs of factors of each integer.
1) 18
2) 30
3) 17
4) -8 find an equation of the ellipse having the given points as foci and the given number as sum of focal radii.
(-9,0);(9,0);30

one of these is it: x^2/15 + y^2/12 =1 or x^2/225 + y^2/144 =1
or x^2/15 - y^2/12 = 1