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Algebra

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Find a Proper Fraction

ALGEBR-H18T4G

Which of the following rational expressions represent proper fractions?

A

$\cfrac{x}{x^{2} + 1}$

B

$\cfrac{x^{2} + 1}{x + 1}$

C

$\cfrac{x^{3} - x}{x^{2}}$

D

$\cfrac{x^{2} + 2x}{3 + x}$$