The table below gives the annual sales (in millions) of a product.
2006
year
sales
1998
107
1999
152
2000
187
2001
212
2002
227
2003
232
2004
227
2005
212
187
What was the average rate of change of annual sales
a) Between 2002 and 2003
millions of dollars/year
b) Between 2002 and 2005
millions of dollars/year
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Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3