21. $$\sqrt {176 + \sqrt {2401} } $$ is equal to = ?
22. $${\left( {15} \right)^2} + {\left( {18} \right)^2} - 20 = \sqrt ? $$
23. $$\sqrt ? \times \sqrt {484} = 1034$$
24. $$\sqrt {11881} \times \sqrt ? = 10137$$
25. In the equation $$\frac{{4050}}{{\sqrt x }} = 450{\text{,}}$$ the value of x is = ?
26. $$\sqrt {\frac{{16}}{{25}}} \times \sqrt {\frac{?}{{25}}} \times \frac{{16}}{{25}} = \frac{{256}}{{625}}$$
27. The square root of $$\left( {{{272}^2} - {{128}^2}} \right)$$ is = ?
28. If $$y = 5{\text{,}}$$ then what is the value of $$10y\sqrt {{y^3} - {y^2}} $$ = ?
29. $$\sqrt {\frac{{25}}{{81}} - \frac{1}{9}} = ?$$
30. $${\left[ {{{\left( {\sqrt {81} } \right)}^2}} \right]^2} = {\left( ? \right)^2}$$
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