exam Maths Puzzle Numerical Ability

what is the domain of this y=2x-1

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exam Other Question

How could I solve equations like these:
8(p-2)>5p+7

And how can this be solved:
∆ABC is isosceles with base BC. If AB=3x+1 cm, AC=2x+5 cm, and BC is=x+11, find the perim I need help perfoming the indicated operation

f(x)=x+2 g (x)=x2-1

I need to find (g of)(x)