book Maths Puzzle Numerical Ability

What inequality results if both sides of -6<10 are multiplied by -1?
What inequality results if both sides of -3/5x<-24 are multiplied by -5/3?

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book Other Question
solve: 2x-5=4-3x Find an orthogonal basis of the following subspace L = span (v1,v2,v3), where v1=(0,0,1,1), v2=(1,0,1,0), v3=(0,1,-1,-1)