exam Maths Puzzle Numerical Ability

Solve by the elimination method
4x-8y=1
4x-8y=2

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exam Other Question

Evaluate and give the domain.

f(x)= 16-x^2 g(x)= 4-x

Find f(x)/g(x)
3rd time lucky maybe

I need some help on one of my questions. I need to make g the subject...

T = 2(pi)*[square root of (l/g^3)}

Can someone please help me......: and its the letter L not the number 1