An exponential function repeatedly multiplies an initial amount by the same positive number called the

 constant ratio

Step-by-step explanation:

The exponential growth function  can be modeled as  where A > 0  the initial amount and b > 0.

If b > 1, then the value of  the function increases as x increases other wise decreases.

Here, b is the constant ratio.

Therefore, An exponential function repeatedly multiplies an initial amount by the same positive number called the constant ratio.

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09