exam Maths Puzzle Numerical Ability

Describe the dimensions of a pyramid with a volume of 30 cm^3?

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exam Other Question

2x^2+13x+6

2k^2-7k+6

2x^2+7x-4



(i need the answers to these questions)^
I have a question regarding Orseme's geometric graphical model?

the sum of 1/2 + 2/4 + 3/8 + ... + n/2^n + ... = 2.

I can't figure out how to prove this.