What is the modulus of the complex number z = -3 + 4i?
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What is the definite integral of f(x) = 3x^2 + 2x + 1, from x = 0 to x = 4?
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Math Question: In a right triangle, the adjacent side has a length of 5 units and the hypotenuse has a length of 13 units. Find the length of the opposite side.