exam Maths Puzzle Numerical Ability

Find the maximum value of y = -x^2 + 6x. The answer I got was 8 but it was not correct.

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exam Other Question

A coffee merchant has coffee beens that sell for $9 p/lb & $12 p/lb. the two types are mixed to to create 100 lb of a mixture to sell for $11.25 p/lb. How much of each type of bean should be used in the mixture? can you please send a radical problems related in nursing?!!!!!!!!!! Please