A = student selected is an eighth grader B = chosen student takes bus P(A) = probability of selecting eighth grader P(A and B) = probability of selecting eighth grader AND student who takes bus P(A and B) = probability of selecting eighth grader who takes the bus P(B|A) = probability of selecting someone who takes the bus given they are an eighth grader
she has 17 slik roses already, and 6 friends give her 3 silk roses each, so that's 6 times 3, which makes 18, and 17 plus 18 is 35, so she has 35 silk roses in all.
