What is the value of 'a' in the equation π¦ = ax^2, if the vertex of the parabola is (2, 5)?
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In triangle ABC, if AB = 5cm, BC = 7cm, and AC = 8cm, is triangle ABC congruent to triangle XYZ with XY = 8cm, YZ = 5cm, and XZ = 7cm?
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Math question: In how many ways can a committee of 4 members be chosen from a group of 10 individuals? Express your answer using the combination formula.