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Which solutions are exact values, and which are approximations?

$x^2=40, \qquad\qquad x=\pm 6.32455532$

$t^2=\dfrac{81}{64}, \qquad\qquad t=\pm 1.125$

$w^2=50, \qquad\qquad w=\pm 5\sqrt{2}$

$b^2=(0.632)^2, \qquad b=\pm 0.632$

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