exam Maths Puzzle Numerical Ability

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?

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exam Other Question

explain how the graph of y-5=(x-3)^2


This is what I did.

y-5=(x-3)^2
y=(x-3)^2+5

answer: y=x^2 right 3 units and up 5

??? right or way off?
The following augmented matrix represents the system of what equstions:

1/3/2/4
2/-1/5/-2
-3/1/6/1