Using the rate function given and the subtraction operation, the increase in the population is 8
The rate of increase per year :
Increment in the third year :
500 + 4(3)
500 + 12 = 512
Increment in 5th year :
500 + 4(5)
500 + 20 = 520
Change in size between 5th and 3rd year :
Hence, population increased by 8 cattle.
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