A population of bacteria originates with 8,700 bacteria. After a harmful substance is introduced into the environment, the rate of
decline of the bacteria population is 9% per hour. In addition, 50
bacteria are added to the population each hour. How many bacteria
are in the population after three hours (round your answer to the
nearest whole number)?

answers are:
1) 7,068
2) 6,693
3) 7,300
4) 6,141

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)  

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3 ft is your answer