exam Maths Puzzle Numerical Ability

Can you please help me simplify -5x^0 please? Thanks!

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exam Other Question

solve the system by additio or substitution
3x+6y=0
x= 2/3

I have no idea how to work this problem with a fraction. Please help.
How do you divide polynomials using synthetic division?
My problem is:

(3x^3-11x^2+7x-44)/(x-4)


Thank-you