Aschool director must randomly select 6 teachers to participate in a training session. there are 34 teachers at the sxhool. in how many different ways can these teacher anthea be selected, if the order of selelection does not matter

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6