exam Maths Puzzle Numerical Ability

Can someone please help me?

Solve by graphing
3x-6y=9
x-2y=3

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exam Other Question

I could use some help with this problem
What is the positive exponent after simplifying

(x^2)^-3(x^-2)/(x^2)^-4

Thank you for helping me.
Find p(-3) and p(5) for the function:
p(x)=2x^4+3x^3-9x^2+16x+13