exam Maths Puzzle Numerical Ability

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

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exam Other Question

If a bag contains 15 marbles, how many samples of 2 marbles can be drawn from it? How many samples of 2 can be drawn in which both marbles are blue? find the domain.

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