Answer:
If the cost X is higher or equal than 35, then no one wants to buy the any mouse pads.
Step-by-step explanation:
When N is 0 or lower then it means that no one buys it.
N=35x-[tex]x^{2}[/tex], if N=0 then
0=35x-[tex]x^{2}[/tex] or
35x=[tex]x^{2}[/tex] dividing each side by x we get:
35=x
This is the cost which nobody will buy the mouse pad anymore.
