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netineya [11]
3 years ago
12

She had 8 subscribers at the beginning of the month. One month later, her number of subscribers doubled and continued to double

each month. Create a function to model the growth in the number of subscribers to the singer's channel since the month it had 8 subscribers. What is a reasonable domain in this situation?
Mathematics
1 answer:
sammy [17]3 years ago
3 0

Answer:

f(x)= 8(2)^x

Step-by-step explanation:

She had 8 subscribers at the beginning of the month. One month later, her number of subscribers doubled and continued to double each month

when month =0  the subscribers = 8    (0,8)

month =1 , subscribers = 16            (1,16)

month = 2, subscribers = 32  and so on         (2,32)

Subscribers are doubled every month

For exponential growth we use formula y=ab^x

where 'a' is the initial value. given initial value is 8 so a=8

To frame the function , we plug in (1,16) a=8 and solve for b

y = ab^x

16 = 8b^1

divide by 8 on both sides

b^1 = 2  so b= 2

Exponential function becomes (a=8,  b= 2)

y = ab^x

f(x)= 8(2)^x

She had 8 subscribers at the beginning of the month

So when month x=0  then the number of subscribers = 8

Domain x starts from 0 month and it goes on increasing

Domain x be the number of months.



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