book Maths Puzzle Numerical Ability

A rectangular playground is being constructed using a barn as one side and 80 meters of fencing to form the other three sides. What is the maximum area of such an enclosure?

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If I have these terms to add, x, c to the third power,x to the 2nd power over m to the third power, c to the third power, x to the second power, PLUS m to the third, x to the seco The function H(x)= .004x^2-.197x+5.406 models the percentage of total income that an individual that is x years of age spends on health care. A. use the model to approximate the pe