exam Maths Puzzle Numerical Ability

in trapezoid ABCD, AB is parallel to CD, and AB = 10, BC = 9, CD = 22, and DA = 15. Points P and Q are marked on BC so that BP = PQ = QC = 3, and points R and S are marked on DA s

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The Volume of spheres are proportional to the cubes of their radii. Two spheres of the same material weigh 3.6 kg and 2.7 kg and the radius of the smaller one is 2 cm. If the two were melted down and formed into a single sphere,what would be the radius..? x squared+8x+25=o
choose one of the following as the answer
A)-4+6i, -4-6i
b)4+3i, 4-3i
c)4+6i, 4-6i
d)-4+3i, -4-3i