exam Maths Puzzle Numerical Ability

f(x)=-x2+3
2= squared (dont know how to do squared on the computer, sorry)

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The members of a flying club plan to share equally the cost of a $200,000 airplane. The members want to find five more people to join the club so that the cost per person will decrease by $2000. How many members are currently in the club? I am doing solution of systems of equations, and i have to determine weather each system of equations has one solution, no solution, or many solutions. By graphing and if it has on