book Maths Puzzle Numerical Ability

z-12=6 how do I work this out

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Let f(x)=x^2-25 and g(x)=x+5, find a)(f-g)(x) and b)(f/g)(x) Tickets for a concert were sold to adults for $3 and to students for $2. If the total receipts were $824 and twice as many adult tickets as student tickets were sold, then how many of each were sold?