exam Maths Puzzle Numerical Ability

Tutor could you help me ..thank you

Express the number in terms of i - sqrt -9 and sqrt -28

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exam Other Question

Graph 1.1x-1.9y=4x18 Find the intercepts of 1.1x-1.9y=4.18 please show both if you can, the graph and the intercepts. Could someone please help me?

Given f(x)=x^2 and g(x)=3x-1, find (f*g)(2) and (g*f)(x)

Any help will be greatly appreciated.