book Maths Puzzle Numerical Ability

The number of students in the psychologhy class is 34 fewer than the number of students in world history. The total enrollment for the two classes is 134 students How many stduents are in each class.

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find the opposite of 4/11. express yor answer as a common fraction? I have a question about matrices and determinants. Here is the question:

2,1,-1,-1
-1,0,2,3
0,-5,0,-2
-1,-1,0,-4

Here are my calculations:

step 1- recalulated rows 1 an