Answer:
Step-by-step explanation:
divide the number of blue chips over the total chips
the probability that first one will be blue 4/9
the probability that second one will be blue 4/8
It's very simple: It's the surface of a base times the height
$35 per ticket
the unit rate means the cost of 1 ticket
divide $420 by 12 for unit rate
= $35 per ticket