exam Maths Puzzle Numerical Ability

solve inequality for z
8z + 7 < 1/2z + 2

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Hope you can help me

"What degenerate form or forms of the parabola cannot be obtained from the intersection of a plane and a double napped cone? Describe how to obtain this (or these). Use a diagram to support your answer."

Thanks in advanced what is the simplest form of (2x^3y)(4x^2y^3)
a. 8x^6y^3
b. 2xy
c. 2x^6y^3
d. 8x^5y^4