According to a recent study, the average length of a newborn baby is 19.219.2 inches with a standard deviation of 1.21.2 inch. the distribution of lengths is approximately normal. complete parts (a) through (c) below. include a normal curve for each part.
a. the probability that a baby will have a length of 20.4 inches or more is
b. the probability that a baby will have a length of 21.5 inches or more
c. the probability that a baby will have a length between 17.6 and 20.8 inches

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?