exam Maths Puzzle Numerical Ability

Find the Inverse of the following function:

f(x)=10^(x-3)+4

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exam Other Question

4xsquared - 2xsquared + (-8xsquared) Tell wether the ordered pair is a solution of the linear system.

(1,-1);
2x - y = 3
4x + 2y = 2

Any help with this equation would be Greatly</b> appreciated.