exam Maths Puzzle Numerical Ability

find the inverse function
f(x) = 9 - 10x^2 , x < 0

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exam Other Question

Construction. A garden area is 30ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is teh width of the path? Which of the numbers 9, 10, or 11 is the solution of 83 = 93 - x?