Answer:
y = 4 * (7/4) ^x
Step-by-step explanation:
y = ab^x is the general form of an exponential function
where a is the initial value and b is the growth rate
We know 2 points, (0,4) or the initial value and (1,7)
a =4
y = 4 b^x
7 = 4 b^1
We can solve for b
Divide by 4
7/4 = b
y = 4 * (7/4) ^x
