exam Maths Puzzle Numerical Ability

How do you explain how to do this problem and solve, thanks.
4 In x + 7 In y - 3 In z

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exam Other Question

An employee who produces x units per hour earns an hourly wage of y = 0.55x + 8 (in dollars). Find the hourly wage for an employee who produces 9 units per hour.

Thank you. what is the total surface area of a rectangular room 6 meters by 7 meters by 4 meters high? ignore doorways and windows