exam Maths Puzzle Numerical Ability

How do I graph the solution set of x<-7??? Someone PLEASE HELP!! Thank You

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exam Other Question

32^3/5 Minimizing cost.

A company uses the formula C(x)=0.02x2-3.4x+150 to model the unit cost in dollars for producing x stabilizer bars. For what number of bars is the unit cost at its minimum? What is the unit cost at that level of production.