book Maths Puzzle Numerical Ability

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!!

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book Other Question

FIND TWO QUADRATIC FUNTIONS, ONE THAT OPEN UPWARD
F(X)=X^2=B1+C1
AND ONE THAT OPENS DOWNWARD
G(X)=-X^2+B2+C2

WHOSE GRAPHS HAVE X INTERCEPTS AT (4,0),(13,0)
B1=-17
C1=52
B2 I am helping my son who is in the 4th grade, they are evaluating expressions. Can you help me with this:

(84 divided by z)- 6 for z = 7

and

(48 divided by h) x 2 for h = 8