Question Help Please!

Question

In the model y = 500(1.3)^x, what's the initial value (y-intercept)?



The model y = 500(1.035)^x indicates the value of an investment, where x is the number of whole years. What's the growth factor (the ratio from one year to the next)?

What's the model for a colony of bacteria that starts with 20 bacteria and which doubles every day?

y = 20x^2

y = 2(20)^x

y = 2x + 20

y = 20(2)^x

y = 20x + 2

Answer 1

Hi

the correct answer is y = 20 (2)^x because

x	y
0	20
1	40
2	80
3	160
4	320

in fact this model follows geometric series you remember a_n = a * r^n-1

I hope it is useful,

Minoo