Answer:
(1,-4)
Step-by-step explanation:
Answer:
The interval for which <em>y</em> is a decreasing function of <em>x</em> is:

Or as an inequality:

Step-by-step explanation:
We are given the equation:

And we want to find the range of values <em>x</em> for which <em>y</em> is a decreasing function of <em>x</em>.
<em>y</em> is decreasing whenever <em>y'</em> is negative. Find <em>y'</em> using the Quotient Rule:

Differentiate:

<em>y</em> is decreasing whenever <em>y'</em> is negative. Thus:

Multiply both sides by <em>x²</em>. This is always positive so we do not need to change the sign:

Factor:

e<em>ˣ</em> is always positive. So:

Adding one to both sides produces:

Therefore, <em>y</em> is a decreasing function of <em>x</em> when <em>x</em> is less than one (and greater than 0).
In interval notation:

Or as an inequality:

How much does it cost? there is no cost specified
Step-by-step explanation:
the answer is:
y=2
the graph is constant at 2