exam Maths Puzzle Numerical Ability

The revenue, in dollars, when x pairs of shoes are sold is given by 3x� -95. Find the revenue when 12 pairs of shoes are sold. What is the average revenue per pair of shoes?

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please help me the question is a take home test.

in chemistry class, 9 liters of a 4% SILVER IODIDE solution must be mixed with a 10% solution to get a 6% solution. how many liters of the 10% solution are needed? how do you solve and then graph the parabola: y= -x(to the second power) + 2x+3

this is not from a textbook***