exam Maths Puzzle Numerical Ability

find the maximum value of y=-x^2 + 6x

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exam Other Question

you need to select a 4 character password for a computer account. Any digit 0-9 and any letter A-Z can be used for a character, and digits and letters can be repeated. How many possible passwords are there? When x number of units are sold, the price of each unit (in
dollars) is given by p=-x/2+75. Find the unit price when the following quantities are sold: 2, 7, 9, 11.