Cuanto es el 50% de 140, por favor

Which of the following of the following sets of side lengths could not form a triangle?

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january. what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed. use 3.14 for π .