Incorrect. Each of the radicands falls between the perfect squares 9 and 16, so each square root is between $\displaystyle\sqrt{{{9}}}\usepackage{cmbright}\Huge\$ and $\displaystyle\sqrt{{{16}}}\usepackage{cmbright}\Huge\$ , or between 3 and 4. Determine whether each radical expression is closer to 3 or 4 to make an initial estimate. Then try squaring the approximations to find the best estimate for each radical expression.