exam Maths Puzzle Numerical Ability

Please HELP!!!! I really need it!!!!

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exam Other Question

Solve the problem:

An employee who produces x units per hour earns an hourly wage of y = 0.55x + 7 (in dollars). Find the hourly wage for an employee who produces 13 units per hour.
Help! I am stuck!
I need to simplify.

Here is the original problem:

(sq.rt.3 + 5)(sq.rt.3 -3)