How many zero pairs does this expression have -4+6

With finding limits of multi variable !

Given: prst square pmkd is a square pr = a, pd = a find the area of pmct.

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55