To simplify this all you need to do is distribute the 4x across each term in the parenthesis
Answer:
x=4,y=2
Step-by-step explanation:
solve one of the equations for x/y and then plug it into the other
- 3
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The probabilities of knocking down zero, one, and two pins are

and

, respectively. The total probability of knocking down at most two is thus

, or

.