Answer:
BC = 25
Step-by-step explanation:
To find the length of BC you need to use the pythagorean theorem.
There are two part to a triangle that need to be put into this equation. The hypotenuse(c) and the legs(a, b). The legs would be the side NEXT to the right angle. The hypotenuse is ACROSS from the right angle. In this equation we are looking for the hypotenuse. It doesn't matter which letter the legs replace just remember that the hypotenuse alway has to be C.
Now you have to square the numbers then add.
Now find the square root of 625 to get rid of the squared in the C.
c = 25
Hope this helped.
a. There are four 5s that can be drawn, and 
ways of drawing any three of them. There are 
ways of drawing any three cards from the deck. So the probability of drawing three 5s is
In case you're asked about the probability of drawing a 3 or a 5 (and NOT three 5s), then there are 8 possible cards (four each of 3 and 5) that interest you, with a probability of 
of getting drawn.
b. Similar to the second case considered in part (a), there are now 12 cards of interest with a probability 
of being drawn.
c. There are four 6s in the deck, and thirteen diamonds, one of which is a 6. That makes 4 + 13 - 1 = 16 cards of interest (subtract 1 because the 6 of diamonds is being double counted by the 4 and 13), hence a probability of 
.
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Note: 
is the binomial coefficient,
(2x) / 4 ......The quotient of 2 times some number and four
