The water level dropped 3 inches per week for 4 weeks. By how much did the water level change?

3 in=1 week then 3*4 would be 12

3 4 34 12

To find out how much the water level changed, we need to multiply the rate at which it dropped per week by the number of weeks.

In this case, the water level dropped 3 inches per week for 4 weeks. So we can calculate the change in water level by multiplying 3 inches/week by 4 weeks:

3 inches/week x 4 weeks = 12 inches

Therefore, the water level changed by 12 inches.