exam Maths Puzzle Numerical Ability

Hello,

I stuck, how would I do the following:

For the exponential function e^x and logarithmic function log x, graphically show the effect if x is doubled.

Thank you for

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exam Other Question

If there are 6 * 10^9 people on the Earth and there is enough freshwater
to provide each person with 8.79 * 10^5 L, how much freshwater is on the
Earth?
(3x^3y^5m^2)(x^2y)^-2
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x^2y^0y^-4

This problem needs to be simplified, so far I have (9x^4y^10m^4)(x^-4y^2)
Am I anywhere close to the correct answer?