exam Maths Puzzle Numerical Ability

Please help me!

Simplify

4 square root of 324

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exam Other Question

16 is 40% of what number? Solve the following systems of linear inequalities by graphing.
3x-y<2
x+y>2

3x-y<2
y<-3x+2

x+y>2
y>2+x

I'm double checking to see if I am on the right track.