exam Maths Puzzle Numerical Ability

in interval notation, what is the domain of f(x) = 2x^3 - 4x - 7?

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exam Other Question

give the sum for r(r+1)(r+2)(r+3)(r+4)for r=1 to n perform the indicated operation. Simplify if possible.
6a^2-8a-8 / a-2
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2a^2-9a-56 / a-8