exam Maths Puzzle Numerical Ability

x^2-7x+10=0

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If there are 6 x109 people on the Earth and there is enough freshwater to provide each person with 8.79 x 105 L, how much freshwater is on the Earth? I have a triangular prism with these dimensions: base width of 8, prism height of 9 and a base depth of 6. I am to use the pythagorean theorem to find the slant height of the trian