exam Maths Puzzle Numerical Ability

combine like terms and write in descending order
x-15x^2 + 19x -22x^3

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#27
Business alternative
The investor of a new toy offers the kiddy toy company exclusive rights to manufacture and sell the toy for a lump-sum payment of $25,000.After estimatin Solve system by graphing: y = -2/3x

2x +3y = 5