There are 450 seats in the lower level of a concert hall Whith b balcony seats in the upper level. So far, 172 tickets have been sold, which is 1/5 of the total number of seats in the concert hall. How many balcony seats are in the concert hall

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