... sqrt ((... 0.0131)/(7(7-1)))approx (cm)

To solve the expression $\sqrt{\frac{0.0131}{7(7-1)}}$, we need to follow these steps:<br /><br />1. Calculate the denominator: $7(7-1) = 7 \times 6 = 42$.<br />2. Divide the numerator by the denominator: $\frac{0.0131}{42} \approx 0.000310952$.<br />3. Take the square root of the result: $\sqrt{0.000310952} \approx 0.0177$.<br /><br />Therefore, the approximate value of the expression is $0.0177$ cm.