exam Maths Puzzle Numerical Ability

An employee who produces x units per hour earns an hourly wage of y = 0.55x + 7 (in dollars). What is the hourly wage for an employee who produces 13 units per hour?

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If f(x)=x(x+1)(x-4), us ethe interval notation to give all values of x where f(x)>0?
Having trouble with this one, but my answer is (-1,4), is this right, thanks so much for check Tiger Woods obtained an average score of 72 during the four rounds of golf at the Player's Championship in 2007. Explain how you can use the distributive property to mentally calc