exam Maths Puzzle Numerical Ability

find the domain.

f(x)=sqrt(x+4), g(x)=x^2

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exam Other Question

I need to solve the following equations algebraically. Some of my practice problems are as follows. If I could get some answers that would be great so I can be better prepared fo P(5,7) to Q(x,y) what is the delta x and delta y from P to Q?