exam Maths Puzzle Numerical Ability

Please help me solve this equation:
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(6+3x+9x2+8x3)+ (4-3x+9x2-8x3)

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exam Other Question

Graph the following equations, using the intercept method.

2x + 3y = 6 how many years will it take $2600 to triple itself if it is invested at 3.6% simple interest