exam Maths Puzzle Numerical Ability

Graph the linear equation 4x-5y=40

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exam Other Question

Simpify: 5√2(7√8 + 5√3) (c^-1)^-12(c^-5)^6/(c^-4)^0(c^3)^-3

answer 1/c^9

How do I get there? I am so lost! please help