How can (a + b)², be rewritten

What is the answer to question 11? will give extra points! include a explanation (reasonable) for you : )

Situation: . find the substance's half-life, in days. round your answer to the nearest tenth. a 11 gram sample of a substance that's used to treat thyroid disorders has a k. value of 0.1247. enter the correct answer n - noekt done no - initial mass (at time t = 0) n - mass at timet k a positive constant that depends on the substance itself and on the units used to measure time t= time, in days

Which container holds more, a half gallon milk jug or a 2 liter juice bottle