Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 4343 of the 4848 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 8989 of the 106106 subjects developed rhinovirus infections. Use a 0.010.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below.

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

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.

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13