exam Maths Puzzle Numerical Ability

Graph 2x - y = 4.

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exam Other Question

I am not good at simplifying when it comes to multiplying

Square root of 7 x square root of 14

and
(2x square root 2x)(3 square root 5x)

and
square root of 7 (5 square root 5-3 sqaure root 7)

Thanks a million Rewrite 5π/4 radians in degree measure.