<PRE><B>Question 1127594</B>
&lt;br&gt;
You didn&#39;t specify what the distance &quot;x&quot; is.  I chose it to be the distance from the point on the shore closest to the boat to where the boat lands.&lt;br&gt;
Then the distance rowing is {{{sqrt(x^2+4)}}} and the distance walking is {{{sqrt((x-3)^2+1)}}}.&lt;br&gt;
Then, with the given rowing and walking speeds, the total time for the trip is&lt;br&gt;
{{{(sqrt(x^2+4)/2)+(sqrt((x-3)^2+1))/4}}}&lt;br&gt;
ANSWER a: {{{T = (sqrt(x^2+4)/2)+(sqrt((x-3)^2+1))/4}}}&lt;br&gt;
ANSWER b: Algebraically, there are no restrictions on the domain of that function.  However, logically the reasonable values for x should be between 0 and 3.&lt;br&gt;
ANSWER c: A window of 0 to 3 for x and 1 to 2 for y produces a good graph.&lt;br&gt;
ANSWER d: The minimum value of the function is when x=1.&lt;br&gt;
ANSWER e: That is for you to do....</PRE>