Jillian is using integer tiles to add 7 + (negative 2). she uses the steps below. step 1 7 positive tiles. step 2 7 positive tiles and 2 negative tiles. step 3 7 positive tiles and 2 negative tiles. 2 positive and 2 negative tiles are circled. step 4 7 + (negative 2) = 2 jillian has made an error. in which step does it occur? step 1 step 2 step 3 step 4

According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a) if 200 adult smokers are randomly selected, how many would we expect to have started smoking before turning 18 years old? (b) would it be unusual to observe 170 smokers who started smoking before turning 18 years old in a random sample of 200 adult smokers? why? (a) we would expect about nothing adult smokers to have started smoking before turning 18 years old.