Answer:
Option B
When it was purchased (year 0) the coin was worth $7
Step-by-step explanation:
we have
[tex]f(t)=7(2)^{t}[/tex]
This is a exponential function of the form
[tex]y=a(b)^{x}[/tex]
where
a is the initial value
b is the base
In this problem we have
a=$7
b=2
b=1+r
so
2=1+r
r=1
r=100%
The y-intercept is the value of the function when the value of x is equal to zero
In this problem
The y-intercept is the value of a rare coin when the year t is equal to zero
[tex]f(0)=7(2)^{0}[/tex]
[tex]f(0)=\$7[/tex]
therefore
The meaning of y-intercept is
When it was purchased (year 0) the coin was worth $7
