91Ó°ÊÓ

Simplify. $$\sqrt{300 n}-\sqrt{75 n}$$

Is \(\pi\) greater than or less than \(\sqrt{6}\) ?

Anesthesiologists use a cuffed endotracheal tube to intubate children. For children older than 1 year, a formula for finding the correct size of the internal diameter of the tube in millimeters, \(D\), is \(D=\frac{A}{4}+3.5\), where \(A\) is the age of the child in years. Predict the correct internal diameter of this tube for a 6-year-old child. (Source: Duracher et al., Paediatric Anaethesia, Feb. 2008)

Evaluate. $$\sqrt[3]{64}$$

In the set of real numbers, 0 is the additive identity. Explain why you think it is called the additive identity.

Factor completely. $$4 x^{2}-9$$