exam Maths Puzzle Numerical Ability

operation on polynomials:(36x3-15x2a3-4a2+8)-(2a3+6a-3)

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i have to solve a ratio problem using a system of linear equations. in short the problem says "ratio of Adults to kids is 5:3 at a concert. 480 attended, how many adults and h Thank you hard working folks in advance figured out the points where the grap goes however I need assistance figuring out the doman and range.
1) a)


Given the above graph,