Answer: The exponential model for the area would be 
.
Step-by-step explanation:
Since we have given that
Initial square miles = 8
It gets tripled in every 4 hours.
So, in every 4 hours, it become 3.
In every 1 hour, it becomes 
So, According to question, an exponential model for the area would be
Hence, the exponential model for the area would be
The answer is 2 because I solved it and checked it.
The third graph represents a function.
In a function, every input (x value) has <em>exactly</em> one output (y value). If even a single input has zero or two outputs, the graph does not represent a function.
A good way of testing this is using a vertical line. As you move a vertical line from left to right across a graph, it should always be touching exactly one point on the graphed line.
In this case, every graph fails this vertical line test except for the third graph, so the third graph represents a function.
Multiply each term in one bracket by each in the other:
<span>(I assume x2 means x^2 / x squared) </span>
<span>(x^2 + 3x + 1)(x^2 + x + 2) </span>
<span>= x^4 + x^3 + 2x^2 + 3x^3 + 3x^2 + 6x + x^2 + x +2 </span>
<span>Now collect all terms: </span>
<span>= x^4 + 4x^3 + 6x^2 + 7x + 2 </span>
