exam Maths Puzzle Numerical Ability

Please help me solve this equation:Add and simplify your answer
(6+5x+6x^2+8x^3)+ (3-5x+6x^2-8x^3)

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exam Other Question

A 14 foot ladder leans against the side of a house. How high does the ladder reach if the distance between the bottom of the ladder and the house is 11 feet less then the distance between the top of the ladder and the ground. Write the equation of the line with slope 5 and y intercept (0,-3)