- How do i find critical points and classifications for this problem?

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Is it safe to use ammonia and hydrogen peroxide together? When given the equations x-y=-1, 2y-x=27, x+y =11 how would you use row echelon form to get to the answer (5,6)? A man is 5 times as old as his son 2 years ago the sum of the squares of their age was 114 find the present age of son?answer is 7? How a fuel water separator work ? What makes Astronomy a science and Astrology not even close to being a science?