book Maths Puzzle Numerical Ability

3/2y-3/2y+4

i need to reduce each answer to lowest terms

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book Other Question

how do i know which one is irrational and rational?
A. .67
B. 3 radical 4
C. -
.4
D. 3.14333.... this one i have no clue!!
two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. find the probability that both marbles are white.
thanks, your a great help!!