45 million * [tex]2^{4}[/tex] = 45million * 16 = 720million
Or you can use
[tex]y=Ae^{kt}[/tex]
A is equal to 45 million
To find the rate, k, we can plug in:
[tex]90million=45million*e^{k*1}
[/tex]
[tex]2=e^{k}[/tex]
[tex]k=ln(2)[/tex]
[tex]y=4.5*10^{7}*e^{t *ln2}[/tex]
Knowing that t = 4
[tex]y = 4.5*10^{7}*e^{ln(2)*4}
[/tex]
[tex]y = 720 million [/tex]
