exam Maths Puzzle Numerical Ability

simplify 4-6i/4+6i and express in the form of a + bi

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exam Other Question

can someone help me indicate which type of conic the problem represents
(x+2)^2/25 - (y-1)^2/9 = 1 Find the slope of any line perpendicular to the line through points (0,5) and (-3,-4).
I have tried to read and reread this and going over the material, please help.

Much appreciated for your time,
Barb Neely