exam Maths Puzzle Numerical Ability

6(2x-5)+4(3x-2)

-(x+5)-(3x-12)

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exam Other Question

which is the slope of a line perpendicular to the y=-2x+6?
A.2
B.1/2
C.-1/2
D.-6
E.-1/6 Please help me solve the ff. equation.
1. x^2 = 16i
2. x^3 + 64 = 0
3. x^3 -(32 + 32i sqrt3) = 0
4. 16x^4 = i
5. x^5 - 32 = 0
6 x^3 +(1/2 - i√3/2) = 0