exam Maths Puzzle Numerical Ability

A question on domains with a natural logarithm. Here is it:

g(x) = ln(x+4)

It seems to me that the domain would be: (-4, +infinity).

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exam Other Question

Develop a height equation: A ball thrown upward from the roof of a building 100m tall with an initial velocity of 20m/s. When will the ball reach a height of 80m? 9-3|2t-4|=3