exam Maths Puzzle Numerical Ability

3+lnx=8

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exam Other Question

Suppose you want to add a sprinkler system, and the location of one section of the sprinkler line can be described by the equation

y=-1/2x-4
we have to complete a table for t
Can some one please help me help my grandson with this problem.??
Q: Assuming x is a positive #, useing the Logorithim properties to present the expression; log(x+4) - log x as the logorithim of a single quantity.

Thank you very much.