exam Maths Puzzle Numerical Ability

Please help me solve the equations: 1.) 2x < 8 2.)6x - 5 � 13
3.) {2x - 10 x2 - 49 )
{ x + 7 x - 7 ) This equation is a Multiplicative Property ?

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exam Other Question

(5x+75)^2=250

7(x^2+1)^1/2+28(x^2+1)^-1/2 Suppose you have a bag that contains 4 black, 3 green, 1 red, and 2 orange marbles. Find each probability.

P(red, then orange when red is not replaced)

Thanks this question is hard, by the way P means probability.