12. multi-step the classroom has 12 chairs on
the right side of the room, 15 chairs on the
left, and 9 chairs stacked in the back. mrs. kim
wants to divide the chairs evenly into 3 groups.
which expression represents the situation?
(a) 12 + 15 +9x3
b
©
d
12 + 15 + (9-3)
12+15+9+3
(12 + 15 + 9) = 3

Margie is practicing for an upcoming tennis tournament. her first serve is good 20 out of 30 times on average. margie wants to know the estimated probability that her first serve will be good at least four of the next six times she serves. how could she design a simulation for this scenario?