exam Maths Puzzle Numerical Ability

If a jar contains 23 red marbles and 4 green marbles, what is the probability that a green marble will be selected at random?

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can someone help me factor these problems? Thanks.

1.4r^3-4

2.(21-7t)+(3r-rt)

3.x^3+64y^3

4.(x^3+7x^2)(-4x-28)
Hello, I need help with some domain problems,the first problem is,solve y= -2x+7 if the domain is {-2,0,4,7}.The next one is,find the domain of x minus 2y=1 if the range is {-2,0,5