exam Maths Puzzle Numerical Ability

How do i graph the inequality x<-2.

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exam Other Question

My daughter started prealgebra yesterday and the answer to her question
10 x n = 8 Is n = 0.8 but how do I explain to her how i got it.
I am having a hard time understanding the following equation;
(-2)(4)+5-6-[-2]
________________= ?
(-2)[9+(-5)]

What are the [] brackets used for in the equation? This is one equation.

thanks........