exam Maths Puzzle Numerical Ability

(x/2)(2/3)=4 I can not remember what to do here to save my life. How do I work this problem?

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exam Other Question

can you graph y=f(x)?
if so can you answer these questions related to the graph..
1. explain why f represents the graph of a function?
2. use the graph to find a reasonable esti simplify 6-a+2ac+5c-3ca