exam Maths Puzzle Numerical Ability

Write as a single logorithm:
(1/2)ln(x^2+1)-4ln(1/2)-(1/2)[ln(x-4)+ln x]

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exam Other Question

For the following funtion, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.

This is a fraction. Determine whether each relation is a function.

x^2=1+y^2