Answer:
468
Step-by-step explanation:
831-x would be the equation to find the amount of peanut butter cookies. You'd plug this into the equation to find the amount of cookies in relation to money meaning your equation is 1.5x+1.65(831-x)=1316.7. You then simplify and solve to find 468
The volume of the rectangular prism will be 
<h3>What will be the volume of the rectangular prism ?</h3>
Given that





Thus the volume of the rectangular prism will be 
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The Lagrangian is

It has critical points where the first order derivatives vanish:



From the first two equations we get

Then

At these critical points, we have
(maximum)
(minimum)