book Maths Puzzle Numerical Ability

HOW CAN YOU TELL IF QUADRATIC EQUATIONS OPEN UPWARDS OR DOWNWARDS?
QUADRATIC CURVES ARE SYMMETRICAL ABOUT ON THE AXIS? EXPLAIN
QUADRATIC CURVES ARE PARABOLIC. EXPLAIN

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book Other Question

Simplifying complex fractions has got me down. can you help me with this one?
4x/6y
_____
2/12y
thanks! i want to ask what is the answer of the following;
1.4y-{13x-(14y-2x}
2.5y-{18x-(5y+12x}
3.-{8x-[14y-(5-6x)-2]}
4.-4(x-3y)-(3x+5y)-(6-8y)