A population of 240 birds increases at a rate of 16% annually. Jemel writes an exponential function of the form f(x) = abx to represent the number of birds after x years. Which values should she use for a and b?

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InesWalston InesWalston · Answer 1 · 2018-11-28T11:51:08+01:00

Answer:

[tex]\boxed{\boxed{a = 240, b = 1.16}}[/tex]

Step-by-step explanation:

General exponential function for growth or decay is,

[tex]y=a(1\pm r)^{x}[/tex]

Where,

a = initial value,

r = rate of change

+ is used for growth and - is used for decay.

As here, the number of birds increasing so, the exponential function is,

[tex]y=a(1+r)^{x}[/tex]

And initial value a = 240, r = rate of change = 16% = 0.16

Putting the values,

[tex]y=240(1+0.16)^{x}\\\\y=240(1.16)^{x}[/tex]

Comparing this with the given equation [tex]y=ab^{x}[/tex]

Hence, a = 240, b = 1.16

parmesanchilliwack parmesanchilliwack · Answer 2 · 2019-04-08T07:35:52+02:00

Answer:

The value of a is 240 and b is 1.16.

Step-by-step explanation:

Given,

The initial population of the birds = 240,

Annual rate of increasing = 16 %,

Hence, the population of birds after x years

[tex]P=240(1+\frac{16}{100})^x[/tex]

[tex]=240(1+0.16)^x[/tex]

[tex]=240(1.16)^x[/tex]

We can put P = f(x), ( because, f(x) also shows the population of birds after x years )

[tex]\implies f(x) = 240(1.16)^x[/tex] --------(1)

According to the question,

[tex]f(x) =ab^x[/tex] --------(2),

From equation (1) and (2),

a = 240 and b = 1.16