Answer:
10x+23 (pretty sure) and the * means multiply
Step-by-step explanation:

Compare centers mean you need to compare the median of the two box plots.
Box 1: Median (Q2) = 40
Box 2: Median (Q2 is between 40 and 50 (40 < Q2 < 50)
So the center of box 2 is greater than center of box 1
Hope it helps.
6,600,000,000 in scientific notation is 6.6 × 10^9
The change of the cost changes when the pounds of ham changes. When the pounds of ham is 0, it costs 0 dollars. When the pounds of ham is 3, it costs 12 dollars. The cost changes consistently with the pounds of ham. They change together. Every time the pounds of ham goes up by 3, the cost goes up by 12.