exam Maths Puzzle Numerical Ability

what is a absolute value?

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exam Other Question

Write the equation of the line that passes through point (0, -5) with a slope of 9/7.

The fraction is throwing me off for some reason and I cannot seem to get this right. Thanks!
An employee who produces x units per hour earns an hourly wage of y = 0.55x + 12 (in dollars) Find the hourly wage for an employee who produces 20 units per hour