exam Maths Puzzle Numerical Ability

could you please help me solve step by step : 4(k+2)-8k-5=-3k+9-2(k+6)

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exam Other Question
A rectangle has a area of X^3-6X^2+15X-28 square feet. Its width is X-4 feet. What is its length? How many pounds of seed worth $0.60 a pound must be mixed with 300 pounds of seed worth $0.35 a pound to produce a mixture worth $0.50 per pound?



Thanks so much!!!