exam Maths Puzzle Numerical Ability

Please help me reduce this equation: {{{ 4+2[8-2(25/5*2-4)] }}}.

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exam Other Question

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 How do you do this problem:
Make a table of solutions and graph 3x+y=10