exam Maths Puzzle Numerical Ability

Hi Can I have some help with this piecewise function?

Evaluate the piecewise defined function at the indicated values.
f(x)={(-5 text(if ) x<=3, x + 3 text(if ) x>3)

f(-4) =

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exam Other Question

Graph the feasible region for each system of inequalities
2x-y<1
3x+y<6
Use the binomial theorem to expand the binomial:

(3x^2-1/2square root of y)^4