exam Maths Puzzle Numerical Ability

If there are 6 x 109 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?

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Could you please help with this. Find the corresponding y values for x=-4,-3,-2,-1,0,1,2 if y=x^2+2x-15 Thank you ABCD is a rhombus with a perimeter of 120 units and and area of 720 square units. P is the midpoint of AD. Find the area and the perimeter of triangle ACP?

Thankyou for your h