exam Maths Puzzle Numerical Ability

factoring trinomials by grouping
6q^2+31q+5

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exam Other Question

4√1/2 + 2√18 -6√2/9

Please step-by-step explain process. How many lbs of Brazilian coffee costing $6.00 per lb must be mixed with how many lbs of columbian coffee costing $4.00 per lb to produce 36 lbs of a mixture costing $4.50 per lb?