exam Maths Puzzle Numerical Ability

Help needed please...very confused.

Question: For the exponential function e^x and logarithmic function log(x), graphically show the effect if x is doubled (e^2x and log2x).

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exam Other Question

A cashier saves 1/5 of her gross monthly salary. This is $40 more than is saved by her friend that is a secretary whose salary is $200 greater. If the secretary save 1/7 of her salary. How much does each earn per month? Find three consecutive integers such that the product of the first and second is 36 less than the product of the second and third.
I tried x
x+1
x+2 but did not get any further :(