exam Maths Puzzle Numerical Ability

how do you use a table of values to graph
y=x^2-2x-8

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exam Other Question

the following is an equation describing growth of bacteria. A=Asubo 2^t/d
which term gives the number you start with?
which term is doubling time?
If you start with 100 bacteria use elimination to solve the system 3x+5y=16 and 8x-5y=28 for x