exam Maths Puzzle Numerical Ability

2x^2+13x+6

2k^2-7k+6

2x^2+7x-4

(i need the answers to these questions)^

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-20 - (-1)
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Help please, I believe this is Undefined but want to double check! Thanks so much for your help. Describe the dimensions of a pyramid with a volume of 30 cm^3?