Answer:

Step-by-step explanation:
Given

Required
Determine number of items that gives maximum earnings;
The general form of a quadratic equation is:

And the maximum is calculated as:
If a<0
Comparing
to 
We have that:

Substitute these values to




<em>The number of item that maximizes the function is when y = 15</em>
Answer:
c
Step-by-step explanation:
hope this helps
5.75.
23/4=5.75.
That's pretty much it.
perimeter of a shape is just adding all side lengths together. Since it is a square, all sides are the same so just multiply 16.5 x 4
which is = 66 m.