

We have critical points whenever both partial derivatives vanish:



The Hessian is


At (0,0), we have

, so (0,0) is a saddle point.
At (-1, -1), we have

and

, so (-1, -1) is a local minimum.
At (1, 1), we have

and

, so (1, 1) is also a local minimum.
<span>X = 65(7)
X = 455
Marla did 455 sit-ups in a week</span>
Answer:
6
Step-by-step explanation:
3 quarts=6 pints
He can spend $2.50 on each card. He starts with $13 and ends up with $5 after spending $8 on the book. Since he has 5 left and needs two cards, you divide 5 by 2 and ends up with $2.50. Hope this helps :)