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:
The answer is D) 4, 8, 12, 16, 20
Step-by-step explanation:
Answer:
3.51
Step-by-step explanation:
yes
Answer:
80%
a friend gave me the answer but I lost the work sorry :/