João contou os coelhos, os patos e os bois que havia em sua fazenda, obtendo um total de 340 animais. A seguir, verificou que o número de coelhos era o tripo do de patos e que o número de bois excedia em 20 unidades o total de coelhos e de patos. a) Escreva o sistema linear que representa a situação descrita acima. b) Resolva o referido sistema, determinando a número, de coelhos, bois e patos que havia na fazenda do Sr. João.

Tickets to an orchestra concert cost $25.50 apiece plus a & 2.50 handling fee for each order. if jamal spent $79 how many ticket did he purchase

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.