Edgar used a balance to determine that the mass of a specimen was 0.00063 kg. he collected 6 specimens of the same size. what is the total mass of all 6 specimens, written in scientific notation?

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?