A school choir requires that 60% of the students be sixth graders. If there are 30 sixth-grade students in the choir, what is the total number of students in the choir?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

Math it's appreciated. (picture provided)