The decline in the number of farms means there is a reduction in the number of farms
The number of US farms after 5 years is 3584818
<h3>How to determine the number of farms</h3>
The equation that represents the number of farms is given as:

After 5 years, the value of t is 5.
So, we have:

Evaluate the product

Evaluate the exponent

Evaluate the product

Approximate

Hence, the number of US farms after 5 years is 3584818
Read more about exponential equations at:
brainly.com/question/11832081