Each prize for a carnival booth costs $0.32. how many prizes can you buy with $96?

Step one: divide 96 by .32.
Step two: get 300.
Step three: 300 is the answer

You can buy 300 toys

In the area that she observed, the water level fell 13.64mm over 6.4 years, for an average annual rate of change of:
-13.64 ÷ 6.2 = -2.2 mm/ year. 

The difference between how much average water levels rose and how much water levels in her part of the river fell is:
1.8 -(-2.2) = 4 mm/year

During the 6.2 year period: 
4 mm/year * 6.2 = 24.8 mm