exam Maths Puzzle Numerical Ability

Ok I got the rest of the ones completed but i'm stuck on these three. please help

I am suppose to constuct truth tables and then determine how many cases are true for each state

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exam Other Question

f(x) = {-x , x <-1
x-2 , x > 1}

Find a) f(-3/4)=
b) f(-4)=
If I compared equations with one variable to equations with two variables.
How are they alike? How are they different?