Let a and b be irrational numbers.

1. a divided by b is always, sometimes, or never rational?
2.a + b is always, sometimes, or never rational?
3. (ab)^2 is always, sometimes or never rational?

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone

What is the probably of getting heads when poing a coin and getting a number greater than or equal to 5 when rolling a single diea) 1/6b) 1/3c) 1/4d) 1/12