Answer:
Step-by-step explanation:
children=c
adults=a
c+a=359
a=359-c
2.75c+6a=1621
2.75 c+6(359-c)=1621
2.75 c+2154-6c=1621
-3.25 c=1621-2154
-3.25 c=-533

With no given information, we're not sure that it actually is.
We don't even know for sure whether the two angles are
even on the same planet.
I have answered this question
<span>3. If two row interchanges are made in succession, then the new determinant equals the old determinant</span>